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C50.911 ICD-10-CM Code: Malignant neoplasm of unspecified site of right female breast

Compare with another codeCheck this code on a claim

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Coding at a Glance

Tabular directives
3 inclusion terms · 1 Excludes1 · 1 use-additional code
Risk adjustment
CMS-HCC V28: 1 category · CMS-HCC V22 category 12 · RxHCC V08 category 22

Billable · FY2027A valid, specific ICD-10-CM code, reportable for dates of service in FY2027.

What you need to know

Source: CMS/NCHS Official ICD-10-CM tabular notes, quoted. From the CMS/NCHS tabular list for the release in force. A note the category or block publishes applies to this code too; the Instructions section marks which is which.

Use additional codeReport with this code when documented
  • code to identify estrogen, and other hormones and factors receptor status (Z17.-)
Excludes1Never report with this code
IncludesWhat this code covers
  • connective tissue of breast
  • Paget's disease of breast
  • Paget's disease of nipple

Most relevant related codes MedCoder-derived

Read off the official notes above and this code’s own position in the tabular list. Which to report is a documentation question; Compare shows the two side by side.

CompareCheck ClaimView Related Codes

Inpatient Payment Groups (MS-DRG)

Potential MS-DRG participation — not a DRG assignment.

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v44, Appendix B.

  • MS-DRG 582 — MASTECTOMY FOR MALIGNANCY WITH CC/MCC (MDC 09)
  • MS-DRG 583 — MASTECTOMY FOR MALIGNANCY WITHOUT CC/MCC (MDC 09)
  • MS-DRG 597 — MALIGNANT BREAST DISORDERS WITH MCC (MDC 09)
  • MS-DRG 598 — MALIGNANT BREAST DISORDERS WITH CC (MDC 09)
  • MS-DRG 599 — MALIGNANT BREAST DISORDERS WITHOUT CC/MCC (MDC 09)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Risk Adjustment (CMS-HCC)

Payment categories this diagnosis maps to under CMS-HCC V28, payment year 2026.

  • HCC 23 — Prostate, Breast, and Other Cancers and Tumors

Other models: CMS-HCC V22 HCC 12 · RxHCC V08 HCC 22

Risk scores depend on the enrollee's full accepted diagnosis set and segment; a category mapping alone does not determine payment.

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for C50.911 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2027Effective: October 1, 2026

Trace:FY2027 changesChange historyRelease, file and checksum

Notes without a marker are published on C50.911 itself; “inherited from” names the category or block whose note applies here.

Includes

Conditions the official ICD-10-CM tabular list includes under this code.

  • connective tissue of breast
  • Paget's disease of breast
  • Paget's disease of nipple

Source: inherited from C50

Excludes1 — Not Coded Here

Conditions generally not reported together with this code (Excludes1) -- an error unless the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Source: inherited from C50

Use Additional Code

Supplementary codes the tabular list directs you to add.

  • Use additional code to identify estrogen, and other hormones and factors receptor status (Z17.-)

Source: inherited from C50

Coder workflow for C50.911

MedCoder structured workflow — derived from this code’s own official record

Before you code C50.911

  1. Unspecified does not mean incorrect. When the record gives no greater specificity, C50.911 may be the appropriate code. Check the record for detail that supports a more specific sibling. An unspecified code is for records that do not provide the detail a more specific code needs; a query, not an assumption, is the route to specificity (Guidelines I.A.9.b, I.B.18).

    See the relationships section · Guide: Other vs unspecified (NEC vs NOS) →

  2. Laterality is coded in this family. Confirm the side documented — right, left, or bilateral — and select the matching code (this page’s code: right). The unspecified-side code applies only when the record states no side. Laterality is assigned from the documented side; where a bilateral code exists and both sides are documented, it is used instead of two unilateral codes (Guidelines I.B.13).

    ReviewC50.912 · left, C50.919 · unspecified

    Guide: Laterality coding →

  3. Confirm the documented site and behavior (this code’s block classifies malignant neoplasms), whether the site is primary or secondary, and whether the malignancy is current or a personal history: a previously excised malignancy with no further treatment and no evidence of disease is history, not current disease. Verify the site against the Table of Neoplasms. Neoplasm chapter guidelines (Guidelines I.C.2.a, I.C.2.d, I.C.2.m).

    See the Table of Neoplasms entries · Guide: Active cancer vs history of cancer →

  4. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with C50.911. Excludes1 conditions are not reported together with this code unless the record shows they are unrelated (Guidelines I.A.12.a).

    See the official tabular notes

Choose the right path

  1. Does the record document the detail a more specific sibling code needs?
    Yes → Review the specific siblings in this subcategory.
    No → Continue — C50.911 is appropriate when the documentation goes no further.
  2. Does the documentation support a condition named in C50.911’s Excludes1 note?
    Yes → Do not simply proceed: review the excluded code. Both are reported only when the record shows the two conditions are unrelated.
    No → Continue.

    ReviewC44.501, C44.511, C44.521, C44.591

  3. Is the side documented?
    Yes → Select the code for the documented side (or the bilateral code when both sides are documented and one exists).
    No → Use the unspecified-side code only when the record states no side; a query is the alternative.

    ReviewC50.912 · left, C50.919 · unspecified

Consider C50.911. Then work the Use Additional Code note, and confirm the code is valid for the date of service in the Verify section.

Documentation check

The provider’s diagnostic statement
Codes are assigned from the provider’s documented diagnosis, not from clinical criteria, test values or a medication list (Guidelines I.A.19).
Anatomical site
At the most specific level the record states; a site the classification separates cannot be assumed from a procedure or a measurement.
Laterality
Right, left or bilateral as documented; unspecified only when the record states no side (Guidelines I.B.13).
The conditions the Use Additional Code note names
Reported with this code when documented; a conditional instruction (“if applicable”, “if known”) applies only when the record supports it.
Behavior and current-versus-history status
Malignant, in situ, benign or uncertain; primary or secondary; current disease or personal history (Guidelines I.C.2.m).
Any detail beyond this code’s title
What the record states that a more specific sibling code would capture — or its absence, which itself supports the unspecified code.

Official instructions as workflow

  • Excludes1 — check before selecting C50.911(1 note)

    Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with C50.911: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

    CompareC44.501, C44.511, C44.521, C44.591

    See the official tabular notes · Guidelines I.A.12.a

  • Use Additional Code — after identifying C50.911(1 note)

    Coding workflow: Check whether the documentation supports the additional code(s) the note names, and report them with C50.911 when it does. Where the instruction is conditional (“if applicable”, “if known”), it applies only when the record documents the condition.

    ReviewZ17

    See the official tabular notes · Guidelines I.A.13

Coding decision scenarios

Pattern scenarios for this code’s structure — decision rules, not clinical cases

Documentation: The provider documents the condition in the terms of this code’s title and records no further detail.

Coding question: Is a more specific sibling code supportable?

Path: Review the subcategory for a sibling that names the missing detail.

Reason: A more specific code needs documentation of the distinguishing element; without it the unspecified code is appropriate, and a provider query is the route to specificity (Guidelines I.A.9.b, I.B.18).

Documentation: Both the condition C50.911 describes and a condition named in its Excludes1 note are documented for the same encounter.

Coding question: Can both codes be reported?

Path: Review the Excludes1 note and the excluded code, and look for a provider statement on whether the two conditions are related.

Reason: Excludes1 means the two are not coded together; the exception is when the record shows the conditions are unrelated to each other (Guidelines I.A.12.a).

ReviewC44.501, C44.511, C44.521, C44.591

Documentation: The record documents the condition on one side only.

Coding question: Which code in this family applies?

Path: Select the sibling code for the documented side.

Reason: Laterality is assigned from the documented side; the unspecified-side code is for records that state no side (Guidelines I.B.13).

ReviewC50.912 · left, C50.919 · unspecified

Every row is derived from this code’s own record — its title, tabular notes, 7th-character family and same-category siblings — with fixed MedCoder wording; nothing is inferred about a patient. The official notes and guideline text are in the sections each row links to, and they control.

Don’t confuse C50.911 with…

MedCoder analysis — pairs from this code’s official notes, distinctions written by MedCoder

The codes most likely to be picked instead of C50.911 — named in its own official notes, or sharing its laterality or encounter family — with what separates them and which documentation moves the case. Each links to the full comparison.

  • Z85.3— Specificity relationship (Review)

    C50.911 asserts a malignancy that exists now — present, or still under treatment directed at the site; Z85.3 asserts a breast malignancy that is gone: excised or eradicated, no further treatment, no evidence of disease. The treatment status in the record, not the passage of time, decides which one is true.

    Deciding question: Is any treatment still directed at the breast malignancy, or is there any evidence of disease at the site?

    Full comparison: C50.911 vs Z85.3 →

  • C44.501— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of skin of breast moves the case to C44.501; the two are not reported together unless documented as unrelated.

    Full comparison: C50.911 vs C44.501 →

  • C44.511— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of skin of breast moves the case to C44.511; the two are not reported together unless documented as unrelated.

    Full comparison: C50.911 vs C44.511 →

  • C44.521— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of skin of breast moves the case to C44.521; the two are not reported together unless documented as unrelated.

    Full comparison: C50.911 vs C44.521 →

  • C44.591— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of skin of breast moves the case to C44.591; the two are not reported together unless documented as unrelated.

    Full comparison: C50.911 vs C44.591 →

  • C50.912— Laterality relationship (Review)

    Same condition; these differ only in which side is documented.

    The same condition on the other side; the documented side decides, and a bilateral code, where one exists, replaces the pair when both sides are documented.

    What moves you there: A documented left side moves the case to C50.912.

    Full comparison: C50.911 vs C50.912 →

Relationships are read from this code's own official notes, its laterality siblings and its encounter family; the wording of each distinction is MedCoder editorial, and the documentation named in each “what moves you there” line is the official note phrase or sibling title itself. Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a.

Coding context

Guidelines, coding notes, decision aids, relationships (with MS-DRG and CCSR classification), hierarchy, HCC, coverage and the context map: what a coder reaches for after the core. Each section names whether it is official source data, a MedCoder-derived relationship or MedCoder editorial.

Code Overview

Malignant neoplasm of unspecified site of right female breast is a billable ICD-10-CM diagnosis code (C50.911).

MedCoder summary Summary composed by MedCoder from this code's official ICD-10-CM record. The tabular instructional notes themselves appear verbatim below.

Decision Points

The directives on this code's own record, as a pre-claim checklist.

  1. Laterality is coded in this family. Confirm the documented side matches the code — the opposite-side siblings are in the relationships section. See the opposite-side sibling codes
  2. 1 Use Additional Code instruction — report the named additional code(s) when the documentation supports them. See the Use Additional Code notes
  3. 1 Excludes1 entry — codes named there are generally not reported together with this code (Guidelines I.A.12.a). See the Excludes1 notes

Checklist rows are derived from this code's own official directives; the wording of each check is MedCoder editorial. The official notes themselves are in the sections each row links to.

Verify Before Coding

  • No Medicare Code Editor or MS-DRG Definitions Manual restrictions apply to this code.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Relationships & Classification

MedCoder-derived relationships — computed from published CMS and AHRQ datasets

Other codes that name C50.911 or its code family, from the CMS ICD-10-CM tabular instructional notes, the CMS Table of Neoplasms and the CMS Table of Neoplasms (site match derived from the code title). Tabular-note edges are stored at the code family level that carries each note.

Referenced by 3 Excludes1 notes: C49 — Malignant neoplasm of other connective and soft tissue (via C50.-), C49.3 — Malignant neoplasm of connective and soft tissue of thorax (via C50.-), D05 — Carcinoma in situ of breast (via C50.-).

These codes’ tabular lists mark this diagnosis as mutually exclusive — not reported together unless the conditions are documented as unrelated.

Referenced by 3 Code First instructions across 2 chapters: D75.81 — Myelofibrosis (via C50.-), Z17 — Estrogen, and other hormones and factors receptor status (via C50.-), Z79.81 — Long term (current) use of agents affecting estrogen receptors and estrogen levels (via C50.-).

Each of these codes carries a Code First note naming this condition — when that code is reported, THIS code is sequenced first, ahead of it.

Referenced by 1 Code Also instruction: D61.82 — Myelophthisis (via C50.-).

These codes suggest coding this condition alongside when both are present.

Referenced by 5 Same-site neoplasm codes: C79.81 — Secondary malignant neoplasm of breast (via C50.9.-)Compare C50.911 vs C79.81 →, D05 — Carcinoma in situ of breast (via C50.9.-)Compare C50.911 vs D05 →, D24 — Benign neoplasm of breast (via C50.9.-)Compare C50.911 vs D24 →, D48.6 — Neoplasm of uncertain behavior of breast (via C50.9.-)Compare C50.911 vs D48.6 →, D49.3 — Neoplasm of unspecified behavior of breast (via C50.9.-)Compare C50.911 vs D49.3 →.

These codes represent related neoplasm behaviors affecting the same anatomic site.

Referenced by 5 Screening & history codes: Z12.3 — Encounter for screening for malignant neoplasm of breast (via C50.9.-)Compare C50.911 vs Z12.3 →, Z12.31 — Encounter for screening mammogram for malignant neoplasm of breast (via C50.9.-)Compare C50.911 vs Z12.31 →, Z12.39 — Encounter for other screening for malignant neoplasm of breast (via C50.9.-)Compare C50.911 vs Z12.39 →, Z80.3 — Family history of malignant neoplasm of breast (via C50.9.-)Compare C50.911 vs Z80.3 →, Z85.3 — Personal history of malignant neoplasm of breast (via C50.9.-)Compare C50.911 vs Z85.3 →.

These codes represent screening tests and history codes that refer to this active disease condition.

MS-DRG Grouper Relationships (FY2027)

Potential MS-DRG participation — not a DRG assignment.

FY2027 MS-DRG: not on the CMS CC/MCC list — as a secondary diagnosis this code does not change MS-DRG severity for that release.

Named in the grouper logic of 5 MS-DRGs: DRG 582 (MDC 09), DRG 583 (MDC 09), DRG 597 (MDC 09), DRG 598 (MDC 09), DRG 599 (MDC 09).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Clinical classification (AHRQ CCSR):NEO030 — Breast cancer - all other types (default).

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Related Codes

Same condition, opposite side

Same category and title, differing only in which side of the body is affected.

C50.912 — Malignant neoplasm of unspecified site of left female breast (left)Compare C50.911 vs C50.912 →, C50.919 — Malignant neoplasm of unspecified site of unspecified female breast (unspecified)Compare C50.911 vs C50.919 →

Same CMS-HCC risk category (V28)

CMS maps these diagnoses to the same Hierarchical Condition Category (Prostate, Breast, and Other Cancers and Tumors) for risk-adjusted payment.

C50.619 — Malignant neoplasm of axillary tail of unspecified female breast, C50.621 — Malignant neoplasm of axillary tail of right male breast, C50.622 — Malignant neoplasm of axillary tail of left male breast, C50.629 — Malignant neoplasm of axillary tail of unspecified male breast, C50.811 — Malignant neoplasm of overlapping sites of right female breast, C50.812 — Malignant neoplasm of overlapping sites of left female breast, C50.819 — Malignant neoplasm of overlapping sites of unspecified female breast, C50.821 — Malignant neoplasm of overlapping sites of right male breast, C50.822 — Malignant neoplasm of overlapping sites of left male breast, C50.829 — Malignant neoplasm of overlapping sites of unspecified male breast, C50.912 — Malignant neoplasm of unspecified site of left female breast, C50.919 — Malignant neoplasm of unspecified site of unspecified female breast, C50.921 — Malignant neoplasm of unspecified site of right male breast, C50.922 — Malignant neoplasm of unspecified site of left male breast, C50.929 — Malignant neoplasm of unspecified site of unspecified male breast, C50.A0 — Malignant inflammatory neoplasm of unspecified breast, C50.A1 — Malignant inflammatory neoplasm of right breast, C50.A2 — Malignant inflammatory neoplasm of left breast, C54.0 — Malignant neoplasm of isthmus uteri, C54.1 — Malignant neoplasm of endometrium, +213 more

Related risk categories

These categories interact through CMS's HCC hierarchy — one can suppress the other's risk-adjustment weight when both are present on a claim.

Cancer Metastatic to Lung, Liver, Brain, and Other Organs; Acute Myeloid Leukemia Except Promyelocytic, Cancer Metastatic to Bone, Other and Unspecified Metastatic Cancer; Acute Leukemia Except Myeloid, Myelodysplastic Syndromes, Multiple Myeloma, and Other Cancers, Lung and Other Severe Cancers, Lymphoma and Other Cancers, Bladder, Colorectal, and Other Cancers

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Breast cancer - all other types).

C50.619 — Malignant neoplasm of axillary tail of unspecified female breast, C50.621 — Malignant neoplasm of axillary tail of right male breast, C50.622 — Malignant neoplasm of axillary tail of left male breast, C50.629 — Malignant neoplasm of axillary tail of unspecified male breast, C50.811 — Malignant neoplasm of overlapping sites of right female breast, C50.812 — Malignant neoplasm of overlapping sites of left female breast, C50.819 — Malignant neoplasm of overlapping sites of unspecified female breast, C50.821 — Malignant neoplasm of overlapping sites of right male breast, C50.822 — Malignant neoplasm of overlapping sites of left male breast, C50.829 — Malignant neoplasm of overlapping sites of unspecified male breast, C50.912 — Malignant neoplasm of unspecified site of left female breast, C50.919 — Malignant neoplasm of unspecified site of unspecified female breast, C50.921 — Malignant neoplasm of unspecified site of right male breast, C50.922 — Malignant neoplasm of unspecified site of left male breast, C50.929 — Malignant neoplasm of unspecified site of unspecified male breast, C50.A0 — Malignant inflammatory neoplasm of unspecified breast, C50.A1 — Malignant inflammatory neoplasm of right breast, C50.A2 — Malignant inflammatory neoplasm of left breast, D05.00 — Lobular carcinoma in situ of unspecified breast, D05.01 — Lobular carcinoma in situ of right breast, +45 more

Same Index main term, other category

The ICD-10-CM Index to Diseases and Injuries files this code under the main terms “Carcinoma”, “Cancer”, “Adenocarcinoma”, …; these codes share that main term but sit in a different category of the Tabular List.

C4A.31 — Merkel cell carcinoma of nose (Merkel cell, nose), C4A.39 — Merkel cell carcinoma of other parts of face (Merkel cell, face, specified NEC), C4A.4 — Merkel cell carcinoma of scalp and neck (Merkel cell, neck), C4A.51 — Merkel cell carcinoma of anal skin (Merkel cell, anal skin), C4A.52 — Merkel cell carcinoma of skin of breast (Merkel cell, skin of breast), C4A.59 — Merkel cell carcinoma of other part of trunk (Merkel cell, trunk NEC), C4A.6 — Merkel cell carcinoma of upper limb, including shoulder (Merkel cell, shoulder), C4A.7 — Merkel cell carcinoma of lower limb, including hip (Merkel cell, hip), C4A.8 — Merkel cell carcinoma of overlapping sites (Merkel cell, overlapping sites), C4A.9 — Merkel cell carcinoma, unspecified (Merkel cell), C53.9 — Malignant neoplasm of cervix uteri, unspecified (solid, microinvasive, unspecified site), C56 — Malignant neoplasm of ovary (granulosa cell), C56.9 — Malignant neoplasm of unspecified ovary (ovarian), C58 — Malignant neoplasm of placenta (chorionic, unspecified site, female), C61 — Malignant neoplasm of prostate (duct, unspecified site, male), C62.90 — Malignant neoplasm of unspecified testis, unspecified whether descended or undescended (Sertoli cell, unspecified site), C64 — Malignant neoplasm of kidney, except renal pelvis (renal cell), C73 — Malignant neoplasm of thyroid gland (Hurthle cell), C74.0 — Malignant neoplasm of cortex of adrenal gland (adrenal cortical), C75.0 — Malignant neoplasm of parathyroid gland (water-clear cell), +36 more

Lab tests where this diagnosis supports Medicare coverage (NCD)

Medicare's National Coverage Determination (NCD) program lists this diagnosis as medical justification for these lab tests.

CEA Test, Gamma-glutamyl Transferase (GGT) Test, Iron Panel

Contextual Map

Every relationship of C50.911 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Run C50.911 with these 7 related codes in Claim Check

Hierarchy

Referenced by Excludes1 notes

Referenced by Code First instructions

Referenced by Code Also instructions

  • D61.82 — Myelophthisis[Code Also](via C50.-): “malignant neoplasm of breast (C50.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2027

Referenced by Same-site neoplasm codes

Referenced by Screening & history codes MedCoder-derived

Clinical classification (CCSR)

Risk adjustment (CMS-HCC)

  • HCC 23 — Prostate, Breast, and Other Cancers and Tumors [CMS-HCC]— CMS-HCC V28 · 2026

MS-DRG Grouper

MDC crossing

  • MDC 09 — Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast[MDC crossing]: “Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs. 7,378 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2027

Neoplasm sites

  • Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts) — Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts) — Malignant, Primary [Neoplasm table]: “Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts) (Malignant, Primary)”— CMS Table of Neoplasms · icd10cm-fy2027

Nearest codes (40)

Change history

  • FY2016 — In the code set at ICD-10-CM adoption [Change history]— CMS release files (code change ledger) · icd10cm-fy2016

Relevant guides

Reference

Index terms and tables, published questions and FAQ, every source behind this page with its release and checksum, the date-of-service check and the complete change history.

Neoplasm Table Sites (1)

Official source data — entries quoted as published, in the Index’s own lookup phrasing

Anatomical sites from the official ICD-10-CM Table of Neoplasms that map to this code, with the matching behavior column.

  • Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts) — Malignant, Primary

Real-World Coding Questions

Questions working coders have asked about this code, answered from official sources and reviewed by an editor.

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data
CMS/CDC ICD-10-CM FY2027 tabular list, index and tables, effective October 1, 2026 Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v44.0 (October 2026) Release, file and checksum · Publisher’s page
Inpatient payment groups Official source data
CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v44 Release, file and checksum · Publisher’s page
Risk adjustment Official source data
2026 Mid-Year Final ICD-10 Mappings + Model Software (cms.gov/files/zip/2026-midyear-final-icd-10-mappings.zip, 2026-midyear-final-model-software.zip) — CMS-HCC V28, PY2026 mid-year final release Release, file and checksum · Publisher’s page
Change history and date-of-service validity Official source data
CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page
Comparisons, relationships and the contextual map MedCoder-derived relationship
Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears
Summary and FAQ answers MedCoder editorial explanation
Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 28, 2026 · All releases and sources

Labels on this page: Official source data · MedCoder-derived relationship · MedCoder editorial explanation. How to read the labels · All data sources and release dates · CMS coding rules

Cite this page

Reference this page in a research guide, syllabus or article. The release is included because code content changes each year.

MedCoder.ai. "C50.911 — Malignant neoplasm of unspecified site of right female breast." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/c50.911-malignant-neoplasm-of-unspecified-site-of-right-female-breast

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Malignant neoplasm of unspecified site of right female breast

No changes since FY2016 — additions, deletions, description changes and billable-status changes are tracked through FY2027, and none are recorded for this code. Note changes are tracked from FY2027 only.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to C50.911 in its code family, with their registry titles.

View all codes in the C50 family