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D05.0 ICD-10-CM Code: Lobular carcinoma in situ of breast

Compare with another codeCheck this code on a claim

Billing Status: NO. This is a non-billable ICD-10-CM code: report a more specific billable code beneath it.

Coding at a Glance

Tabular directives
4 inclusion terms · 4 Excludes1

Not billable · FY2027A non-billable heading in the tabular list: report a more specific code beneath it.

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.

Excludes1Never report with this code
  • carcinoma in situ of skin of breast (D04.5)
  • malignant neoplasm of breast (C50.-)
  • melanoma in situ of breast (skin) (D03.5)
  • Paget's disease of breast or nipple (C50.-)
IncludesWhat this code covers
  • Bowen's disease
  • erythroplasia
  • grade III intraepithelial neoplasia
  • Queyrat's erythroplasia

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

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for D05.0 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 D05.0 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.

  • Bowen's disease
  • erythroplasia
  • grade III intraepithelial neoplasia
  • Queyrat's erythroplasia

Source: inherited from D00-D09

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 D05

Coder workflow for D05.0

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

Before you code D05.0

  1. D05.0 is not reportable as written. Select the more specific code beneath it that the documentation supports. Codes are reported to the highest level of specificity the classification provides (Guidelines I.B.2).

    ReviewD05.00, D05.01, D05.02

    See the relationships section · Guide: How to choose an ICD-10-CM code →

  2. Confirm the documented site and behavior (this code’s block classifies in situ 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 →

  3. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with D05.0. 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 documentation support one of the more specific codes beneath D05.0?
    Yes → Select that code and continue the checks below on its own page.
    No → D05.0 cannot be reported as written; query for the specificity its subcategory needs.

    ReviewD05.00, D05.01, D05.02

  2. Does the documentation support a condition named in D05.0’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.

    ReviewD04.5, C50, D03.5

Consider D05.0. Then 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.
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).

Official instructions as workflow

  • Excludes1 — check before selecting D05.0(4 notes)

    Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with D05.0: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

    CompareD04.5, C50, D03.5

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

Coding decision scenarios

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

Documentation: Both the condition D05.0 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).

ReviewD04.5, C50, D03.5

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 D05.0 with…

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

The codes most likely to be picked instead of D05.0 — 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.

  • D04.5— 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 carcinoma in situ of skin of breast moves the case to D04.5; the two are not reported together unless documented as unrelated.

    Full comparison: D05.0 vs D04.5 →

  • C50— 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 malignant neoplasm of breast moves the case to C50; the two are not reported together unless documented as unrelated.

    Full comparison: D05.0 vs C50 →

  • D03.5— 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 melanoma in situ of breast (skin) moves the case to D03.5; the two are not reported together unless documented as unrelated.

    Full comparison: D05.0 vs D03.5 →

  • D05.9— Specificity relationship (Review)

    Overlapping diagnoses in the same category.

    Overlapping codes in the same category — the documentation decides which is the more specific fit.

    What moves you there: A record that documents no more than “Unspecified type of carcinoma in situ of breast” takes D05.9; specificity in the record moves it back here.

    Full comparison: D05.0 vs D05.9 →

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

Lobular carcinoma in situ of breast is a non-billable ICD-10-CM category code (D05.0). A more specific billable subcode must be selected for claims submission.

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

Verify Before Coding

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 D05.0 or its code family, from the CMS Table of Neoplasms and the CMS Table of Neoplasms (site match derived from the code title).

Referenced by 13 Same-site neoplasm codes: C50.0 — Malignant neoplasm of nipple and areola (via D05.-)Compare D05.0 vs C50.0 →, C50.1 — Malignant neoplasm of central portion of breast (via D05.-)Compare D05.0 vs C50.1 →, C50.2 — Malignant neoplasm of upper-inner quadrant of breast (via D05.-)Compare D05.0 vs C50.2 →, C50.3 — Malignant neoplasm of lower-inner quadrant of breast (via D05.-)Compare D05.0 vs C50.3 →, C50.4 — Malignant neoplasm of upper-outer quadrant of breast (via D05.-)Compare D05.0 vs C50.4 →, C50.5 — Malignant neoplasm of lower-outer quadrant of breast (via D05.-)Compare D05.0 vs C50.5 →, C50.6 — Malignant neoplasm of axillary tail of breast (via D05.-)Compare D05.0 vs C50.6 →, C50.8 — Malignant neoplasm of overlapping sites of breast (via D05.-)Compare D05.0 vs C50.8 →, C50.9 — Malignant neoplasm of breast of unspecified site (via D05.-)Compare D05.0 vs C50.9 →, C79.81 — Secondary malignant neoplasm of breast (via D05.-)Compare D05.0 vs C79.81 →, D24 — Benign neoplasm of breast (via D05.-)Compare D05.0 vs D24 →, D48.6 — Neoplasm of uncertain behavior of breast (via D05.-)Compare D05.0 vs D48.6 →, D49.3 — Neoplasm of unspecified behavior of breast (via D05.-)Compare D05.0 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 D05.-)Compare D05.0 vs Z12.3 →, Z12.31 — Encounter for screening mammogram for malignant neoplasm of breast (via D05.-)Compare D05.0 vs Z12.31 →, Z12.39 — Encounter for other screening for malignant neoplasm of breast (via D05.-)Compare D05.0 vs Z12.39 →, Z80.3 — Family history of malignant neoplasm of breast (via D05.-)Compare D05.0 vs Z80.3 →, Z85.3 — Personal history of malignant neoplasm of breast (via D05.-)Compare D05.0 vs Z85.3 →.

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

Related Codes

Same Index main term, other category

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

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 (papillocystic, unspecified site), 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), C75.1 — Malignant neoplasm of pituitary gland (basophil, unspecified site), C7A.1 — Malignant poorly differentiated neuroendocrine tumors (neuroendocrine, high grade, any site), C7B.1 — Secondary Merkel cell carcinoma (secondary, Merkel cell), C80.0 — Disseminated malignant neoplasm, unspecified (generalized, with unspecified primary site), C80.1 — Malignant (primary) neoplasm, unspecified (unspecified site), D04.9 — Carcinoma in situ of skin, unspecified (apocrine, in situ, unspecified site), D06.0 — Carcinoma in situ of endocervix (cervix uteri, in situ, endocervix), D06.1 — Carcinoma in situ of exocervix (cervix uteri, in situ, exocervix), D06.7 — Carcinoma in situ of other parts of cervix (cervix uteri, in situ, specified site NEC), D06.9 — Carcinoma in situ of cervix, unspecified (cervix, in situ), +34 more

Contextual Map

Every relationship of D05.0 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.

Hierarchy

Referenced by Same-site neoplasm codes (13)

Referenced by Screening & history codes MedCoder-derived

Neoplasm sites (17)

  • Neoplasm, neoplastic, areola — Neoplasm, neoplastic, areola — Ca in situ [Neoplasm table]: “Neoplasm, neoplastic, areola (Ca in situ)”— CMS Table of Neoplasms · icd10cm-fy2027
  • Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts) — Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts) — Ca in situ [Neoplasm table]: “Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts) (Ca in situ)”— CMS Table of Neoplasms · icd10cm-fy2027
  • Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), areola — Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), areola — Ca in situ [Neoplasm table]: “Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), areola (Ca in situ)”— CMS Table of Neoplasms · icd10cm-fy2027
  • Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), axillary tail — Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), axillary tail — Ca in situ [Neoplasm table]: “Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), axillary tail (Ca in situ)”— CMS Table of Neoplasms · icd10cm-fy2027
  • Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), central portion — Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), central portion — Ca in situ [Neoplasm table]: “Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), central portion (Ca in situ)”— CMS Table of Neoplasms · icd10cm-fy2027
  • Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), inner — Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), inner — Ca in situ [Neoplasm table]: “Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), inner (Ca in situ)”— CMS Table of Neoplasms · icd10cm-fy2027
  • Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), lower — Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), lower — Ca in situ [Neoplasm table]: “Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), lower (Ca in situ)”— CMS Table of Neoplasms · icd10cm-fy2027
  • Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), lower-inner quadrant — Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), lower-inner quadrant — Ca in situ [Neoplasm table]: “Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), lower-inner quadrant (Ca in situ)”— CMS Table of Neoplasms · icd10cm-fy2027
  • and 9 more

Nearest codes (16)

Change history (3)

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 (17)

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, areola — Ca in situ
  • Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts) — Ca in situ
  • Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), areola — Ca in situ
  • Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), axillary tail — Ca in situ
  • Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), central portion — Ca in situ
  • Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), inner — Ca in situ
  • Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), lower — Ca in situ
  • Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), lower-inner quadrant — Ca in situ
  • Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), lower-outer quadrant — Ca in situ
  • Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), midline — Ca in situ
  • Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), nipple — Ca in situ
  • Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), outer — Ca in situ
  • Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), tail (axillary) — Ca in situ
  • Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), upper — Ca in situ
  • Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), upper-inner quadrant — Ca in situ
  • Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), upper-outer quadrant — Ca in situ
  • Neoplasm, neoplastic, nipple — Ca in situ

Common coding questions

MedCoder editorial

Can D05.0 be billed directly?

No. D05.0 (Lobular carcinoma in situ of breast) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.

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
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. "D05.0 — Lobular carcinoma in situ of breast." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/d05.0-lobular-carcinoma-in-situ-of-breast

Change history

Changed in FY2027, the release in force: Excludes1 note added; Excludes2 note removed.

  • FY2027 — October 1, 2026
    Excludes1 note added
    malignant neoplasm of breast (C50.-)
    FY2027 changes
  • FY2027 — October 1, 2026
    Excludes2 note removed
    malignant neoplasm of breast (C50.-)
    FY2027 changes
  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Lobular carcinoma in situ of breast

Nearest Codes in This Family

Official ICD-10-CM classifications closest to D05.0 in its code family, with their registry titles.

View all codes in the D05 family