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C79.63 ICD-10-CM Code: Secondary malignant neoplasm of bilateral ovaries

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
2 Excludes1
Risk adjustment
CMS-HCC V28: 1 category · CMS-HCC V22 category 8 · RxHCC V08 category 18

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.

Excludes1Never report with this code
  • secondary carcinoid tumors (C7B.-)
  • secondary neuroendocrine tumors (C7B.-)

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 754 — MALIGNANCY, FEMALE REPRODUCTIVE SYSTEM WITH MCC (MDC 13)
  • MS-DRG 755 — MALIGNANCY, FEMALE REPRODUCTIVE SYSTEM WITH CC (MDC 13)
  • MS-DRG 756 — MALIGNANCY, FEMALE REPRODUCTIVE SYSTEM WITHOUT CC/MCC (MDC 13)

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 18 — Cancer Metastatic to Bone, Other and Unspecified Metastatic Cancer; Acute Leukemia Except Myeloid (supersedes HCC 19, HCC 20, HCC 21, HCC 22, HCC 23)

Other models: CMS-HCC V22 HCC 8 · RxHCC V08 HCC 18

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 C79.63 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 C79.63 itself; “inherited from” names the category or block whose note applies here.

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 C79

Coder workflow for C79.63

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

Before you code C79.63

  1. Laterality is coded in this family. Confirm the side documented — right, left, or bilateral — and select the matching code (this page’s code: bilateral). 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).

    See the relationships section · Guide: Laterality coding →

  2. 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 →

  3. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with C79.63. 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 a condition named in C79.63’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.

    ReviewC7B

  2. 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.

Consider C79.63. 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.
Laterality
Right, left or bilateral as documented; unspecified only when the record states no side (Guidelines I.B.13).
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 C79.63(2 notes)

    Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with C79.63: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

    CompareC7B

    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 C79.63 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).

ReviewC7B

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).

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 C79.63 with…

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

The codes most likely to be picked instead of C79.63 — 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.

  • C7B— 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 secondary carcinoid tumors moves the case to C7B; the two are not reported together unless documented as unrelated.

    Full comparison: C79.63 vs C7B →

  • C79.60— 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 “Secondary malignant neoplasm of unspecified ovary” takes C79.60; specificity in the record moves it back here.

    Full comparison: C79.63 vs C79.60 →

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

Secondary malignant neoplasm of bilateral ovaries is a billable ICD-10-CM diagnosis code (C79.63).

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

  • CC as a secondary diagnosis (FY2027). Can raise the stay's MS-DRG severity tier.

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 C79.63 or its code family, from the CMS Table of Neoplasms.

Referenced by 5 Same-site neoplasm codes: C56 — Malignant neoplasm of ovary (via C79.6.-)Compare C79.63 vs C56 →, D07.39 — Carcinoma in situ of other female genital organs (via C79.6.-)Compare C79.63 vs D07.39 →, D27 — Benign neoplasm of ovary (via C79.6.-)Compare C79.63 vs D27 →, D39.1 — Neoplasm of uncertain behavior of ovary (via C79.6.-)Compare C79.63 vs D39.1 →, D49.59 — Neoplasm of unspecified behavior of other genitourinary organ (via C79.6.-)Compare C79.63 vs D49.59 →.

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

MS-DRG Grouper Relationships (FY2027)

Potential MS-DRG participation — not a DRG assignment.

FY2027 MS-DRG: CC — Complication or Comorbidity. Reported as a secondary diagnosis, this code raises the stay's MS-DRG severity tier — except when the principal diagnosis is one of 12 clinically related codes on its CMS exclusion list.

Named in the grouper logic of 3 MS-DRGs: DRG 754 (MDC 13), DRG 755 (MDC 13), DRG 756 (MDC 13).

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

Clinical classification (AHRQ CCSR):NEO070 — Secondary malignancies (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 clinical process (MS-DRG)

Acts as CC — raises the severity of other admissions. CMS groups these diagnoses into one MS-DRG principal-diagnosis exclusion process — a CC/MCC on this list never raises severity when the principal diagnosis is also on it.

C79.61 — Secondary malignant neoplasm of right ovary, C79.62 — Secondary malignant neoplasm of left ovary, C79.83 — Secondary malignant neoplasm of oral cavity, C79.89 — Secondary malignant neoplasm of other specified sites, C79.9 — Secondary malignant neoplasm of unspecified site, C7B.00 — Secondary carcinoid tumors, unspecified site, C7B.09 — Secondary carcinoid tumors of other sites, C7B.1 — Secondary Merkel cell carcinoma, C7B.8 — Other secondary neuroendocrine tumors, C80.0 — Disseminated malignant neoplasm, unspecified, C80.1 — Malignant (primary) neoplasm, unspecified

Same CMS-HCC risk category (V28)

CMS maps these diagnoses to the same Hierarchical Condition Category (Cancer Metastatic to Bone, Other and Unspecified Metastatic Cancer; Acute Leukemia Except Myeloid) for risk-adjusted payment.

C77.9 — Secondary and unspecified malignant neoplasm of lymph node, unspecified, C79.10 — Secondary malignant neoplasm of unspecified urinary organs, C79.11 — Secondary malignant neoplasm of bladder, C79.19 — Secondary malignant neoplasm of other urinary organs, C79.2 — Secondary malignant neoplasm of skin, C79.51 — Secondary malignant neoplasm of bone, C79.52 — Secondary malignant neoplasm of bone marrow, C79.60 — Secondary malignant neoplasm of unspecified ovary, C79.61 — Secondary malignant neoplasm of right ovary, C79.62 — Secondary malignant neoplasm of left ovary, C79.81 — Secondary malignant neoplasm of breast, C79.82 — Secondary malignant neoplasm of genital organs, C79.89 — Secondary malignant neoplasm of other specified sites, C79.9 — Secondary malignant neoplasm of unspecified site, C80.0 — Disseminated malignant neoplasm, unspecified, C91.00 — Acute lymphoblastic leukemia not having achieved remission, C91.01 — Acute lymphoblastic leukemia, in remission, C91.02 — Acute lymphoblastic leukemia, in relapse, C95.00 — Acute leukemia of unspecified cell type not having achieved remission, C95.01 — Acute leukemia of unspecified cell type, in remission, +5 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, Myelodysplastic Syndromes, Multiple Myeloma, and Other Cancers, Lung and Other Severe Cancers, Lymphoma and Other Cancers, Bladder, Colorectal, and Other Cancers, Prostate, Breast, and Other Cancers and Tumors

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Secondary malignancies).

C79.10 — Secondary malignant neoplasm of unspecified urinary organs, C79.11 — Secondary malignant neoplasm of bladder, C79.19 — Secondary malignant neoplasm of other urinary organs, C79.2 — Secondary malignant neoplasm of skin, C79.31 — Secondary malignant neoplasm of brain, C79.32 — Secondary malignant neoplasm of cerebral meninges, C79.40 — Secondary malignant neoplasm of unspecified part of nervous system, C79.49 — Secondary malignant neoplasm of other parts of nervous system, C79.51 — Secondary malignant neoplasm of bone, C79.52 — Secondary malignant neoplasm of bone marrow, C79.60 — Secondary malignant neoplasm of unspecified ovary, C79.61 — Secondary malignant neoplasm of right ovary, C79.62 — Secondary malignant neoplasm of left ovary, C79.70 — Secondary malignant neoplasm of unspecified adrenal gland, C79.71 — Secondary malignant neoplasm of right adrenal gland, C79.72 — Secondary malignant neoplasm of left adrenal gland, C79.81 — Secondary malignant neoplasm of breast, C79.82 — Secondary malignant neoplasm of genital organs, C79.89 — Secondary malignant neoplasm of other specified sites, C79.9 — Secondary malignant neoplasm of unspecified site, +24 more

Same Index main term, other category

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

C54.9 — Malignant neoplasm of corpus uteri, unspecified (Müllerian, mixed, unspecified site), C56 — Malignant neoplasm of ovary (Brenner, malignant), C56.9 — Malignant neoplasm of unspecified ovary (yolk sac, unspecified site, female), C62.90 — Malignant neoplasm of unspecified testis, unspecified whether descended or undescended (yolk sac, unspecified site, male), C64 — Malignant neoplasm of kidney, except renal pelvis (Wilms'), C71.9 — Malignant neoplasm of brain, unspecified (neuroectodermal, primitive, unspecified site), C73 — Malignant neoplasm of thyroid gland (Hurthle cell, malignant), C74.0 — Malignant neoplasm of cortex of adrenal gland (adrenal, cortical, malignant), C75.4 — Malignant neoplasm of carotid body (carotid body, malignant), C75.5 — Malignant neoplasm of aortic body and other paraganglia (aortic body, malignant), C7A.00 — Malignant carcinoid tumor of unspecified site (carcinoid, malignant), C7A.010 — Malignant carcinoid tumor of the duodenum (carcinoid, malignant, duodenum), C7A.011 — Malignant carcinoid tumor of the jejunum (carcinoid, malignant, jejunum), C7A.012 — Malignant carcinoid tumor of the ileum (carcinoid, malignant, ileum), C7A.019 — Malignant carcinoid tumor of the small intestine, unspecified portion (carcinoid, malignant, small intestine), C7A.020 — Malignant carcinoid tumor of the appendix (carcinoid, malignant, appendix), C7A.021 — Malignant carcinoid tumor of the cecum (carcinoid, malignant, cecum), C7A.022 — Malignant carcinoid tumor of the ascending colon (carcinoid, malignant, ascending colon), C7A.023 — Malignant carcinoid tumor of the transverse colon (carcinoid, malignant, transverse colon), C7A.024 — Malignant carcinoid tumor of the descending colon (carcinoid, malignant, descending colon), +97 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.

Alpha-Fetoprotein (AFP) Test, CA-125 Blood Test (Ovarian Cancer), Iron Panel, Pregnancy Test, Thyroid Stimulating Hormone (TSH)

Contextual Map

Every relationship of C79.63 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

Clinical classification (CCSR)

Risk adjustment (CMS-HCC)

  • HCC 18 — Cancer Metastatic to Bone, Other and Unspecified Metastatic Cancer; Acute Leukemia Except Myeloid [CMS-HCC]: “Cancer Metastatic to Bone, Other and Unspecified Metastatic Cancer; Acute Leukemia Except Myeloid — supersedes HCC 19 (Myelodysplastic Syndromes, Multiple Myeloma, and Other Cancers), HCC 20 (Lung and Other Severe Cancers), HCC 21 (Lymphoma and Other Cancers), HCC 22 (Bladder, Colorectal, and Other Cancers), HCC 23 (Prostate, Breast, and Other Cancers and Tumors)”— CMS-HCC V28 · 2026

MS-DRG Grouper

MDC crossing

  • MDC 13 — Diseases and Disorders of the Female Reproductive System[MDC crossing]: “Diseases and Disorders of the Female Reproductive System — 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. 2,238 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2027

Neoplasm sites

  • Neoplasm, neoplastic, corpus, albicans — Neoplasm, neoplastic, corpus, albicans — Malignant, Secondary [Neoplasm table]: “Neoplasm, neoplastic, corpus, albicans (Malignant, Secondary)”— CMS Table of Neoplasms · icd10cm-fy2027
  • Neoplasm, neoplastic, ovary — Neoplasm, neoplastic, ovary — Malignant, Secondary [Neoplasm table]: “Neoplasm, neoplastic, ovary (Malignant, Secondary)”— CMS Table of Neoplasms · icd10cm-fy2027

Nearest codes (33)

Change history

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 (2)

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, corpus, albicans — Malignant, Secondary
  • Neoplasm, neoplastic, ovary — Malignant, Secondary

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. "C79.63 — Secondary malignant neoplasm of bilateral ovaries." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/c79.63-secondary-malignant-neoplasm-of-bilateral-ovaries

Change history

  • FY2022 — October 1, 2021
    Added to the code set
    Secondary malignant neoplasm of bilateral ovaries
    FY2022 changes

Nearest Codes in This Family

Official ICD-10-CM classifications closest to C79.63 in its code family, with their registry titles.

View all codes in the C79 family