Q83.1 ICD-10-CM Code: Accessory breast

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for Q83.1 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2026Effective: October 1, 2025

Notes without a marker are published on Q83.1 itself; “inherited from” names the category or block whose note applies here.

Coder workflow for Q83.1

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

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).

Official instructions as workflow

• Excludes2 — not part of Q83.1(3 notes)

  Coding workflow: The conditions named in this note are not included in Q83.1. When the record documents both, both may be reported; the note is a boundary, not a prohibition.

  CompareQ79.8, N64.82

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

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.

Indexed Clinical Terms (4)

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

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code. These are alphabetic-index entries shown as the Index writes them — lookup phrasing, not necessarily the wording of a final diagnosis.

• Accessory (congenital), breast tissue, axilla
• Axilla, axillary, breast
• Polymastia
• Supernumerary (congenital), breast

Don’t confuse Q83.1 with…

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

The codes most likely to be picked instead of Q83.1 — 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.

• Q83.9— 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 “Congenital malformation of breast, unspecified” takes Q83.9; specificity in the record moves it back here.

  Full comparison: Q83.1 vs Q83.9 →

• Q79.8— Excludes2 relationship (Informational)

  Distinct conditions — both may be reported.

  A distinct condition — both may be reported when both are documented.

  What moves you there: Documentation of absence of pectoral muscle adds Q79.8; it is not part of this code and both may be reported when both are documented.

  Full comparison: Q83.1 vs Q79.8 →

• N64.82— Excludes2 relationship (Informational)

  Distinct conditions — both may be reported.

  A distinct condition — both may be reported when both are documented.

  What moves you there: Documentation of hypoplasia of breast adds N64.82; it is not part of this code and both may be reported when both are documented.

  Full comparison: Q83.1 vs N64.82 →

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.

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 structured relationships — computed from published CMS and AHRQ datasets

Other codes that name Q83.1 or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.

Referenced by 1 Excludes1 note: P83 — Other conditions of integument specific to newborn (via Q83.-).

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

MS-DRG Grouper Relationships (FY2026)

Potential MS-DRG participation — not a DRG assignment.

FY2026 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 2 MS-DRGs: DRG 600 (MDC 09), DRG 601 (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):MAL010 — Other specified and unspecified congenital anomalies (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 category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Other specified and unspecified congenital anomalies).

Q82.0 — Hereditary lymphedema, Q82.1 — Xeroderma pigmentosum, Q82.2 — Congenital cutaneous mastocytosis, Q82.3 — Incontinentia pigmenti, Q82.4 — Ectodermal dysplasia (anhidrotic), Q82.5 — Congenital non-neoplastic nevus, Q82.6 — Congenital sacral dimple, Q82.8 — Other specified congenital malformations of skin, Q82.9 — Congenital malformation of skin, unspecified, Q83.0 — Congenital absence of breast with absent nipple, Q83.2 — Absent nipple, Q83.3 — Accessory nipple, Q83.8 — Other congenital malformations of breast, Q83.9 — Congenital malformation of breast, unspecified, Q84.0 — Congenital alopecia, Q84.1 — Congenital morphological disturbances of hair, not elsewhere classified, Q84.2 — Other congenital malformations of hair, Q84.3 — Anonychia, Q84.4 — Congenital leukonychia, Q84.5 — Enlarged and hypertrophic nails, +59 more

Same Index main term, other category

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

Q69.2 — Accessory toe(s) (toes), Q69.9 — Polydactyly, unspecified (digit), Q74.0 — Other congenital malformations of upper limb(s), including shoulder girdle (carpal bones), Q74.2 — Other congenital malformations of lower limb(s), including pelvic girdle (tarsal bones), Q74.8 — Other specified congenital malformations of limb(s) (sesamoid bones), Q75.8 — Other specified congenital malformations of skull and face bones (face bone), Q76.49 — Other congenital malformations of spine, not associated with scoliosis (vertebra), Q76.5 — Cervical rib (rib, cervical), Q76.6 — Other congenital malformations of ribs (rib), Q76.7 — Congenital malformation of sternum (sternum), Q79.8 — Other congenital malformations of musculoskeletal system (tendon), Q82.8 — Other specified congenital malformations of skin (skin tags), Q89.09 — Congenital malformations of spleen (spleen), Q89.1 — Congenital malformations of adrenal gland (adrenal gland), Q89.2 — Congenital malformations of other endocrine glands (thymus gland), Q89.89 — Other specified congenital malformations (genitourinary organs NEC), Q92.5 — Duplications with other complex rearrangements (chromosome, with complex rearrangements NEC), Q92.8 — Other specified trisomies and partial trisomies of autosomes (chromosome, with complex rearrangements NEC, seen only at prometaphase), Q92.9 — Trisomy and partial trisomy of autosomes, unspecified (chromosome), Q97.8 — Other specified sex chromosome abnormalities, female phenotype (chromosome, sex, female phenotype), +42 more

Contextual Map

Every relationship of Q83.1 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 Q83.1 with this related code in Claim Check

Hierarchy

• Q00-QA1 — Chapter 17: Congenital Malformations, Deformations and Chromosomal Abnormalities (Q00-QA1) (Q00-QA1)[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• Q80-Q89 — Other congenital malformations[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026

Referenced by Excludes1 notes

• P83 — Other conditions of integument specific to newborn[Excludes1](via Q83.-): “congenital malformations of skin and integument (Q80-Q84)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Clinical classification (CCSR)

• MAL010 — Other specified and unspecified congenital anomalies[CCSR]— AHRQ CCSR for ICD-10-CM Diagnoses (HCUP)

MS-DRG Grouper

• DRG 600 — NON-MALIGNANT BREAST DISORDERS WITH CC/MCC[MS-DRG]: “NON-MALIGNANT BREAST DISORDERS WITH CC/MCC (MDC 09)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 601 — NON-MALIGNANT BREAST DISORDERS WITHOUT CC/MCC[MS-DRG]: “NON-MALIGNANT BREAST DISORDERS WITHOUT CC/MCC (MDC 09)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026

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. 7,376 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2026

Index entries

• Accessory (congenital), breast tissue, axilla[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
• Axilla, axillary, breast[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
• Polymastia[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
• Supernumerary (congenital), breast[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026

Nearest codes

• Q83 — Congenital malformations of breast[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• Q83.0 — Congenital absence of breast with absent nipple[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• Q83.2 — Absent nipple[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• Q83.3 — Accessory nipple[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• Q83.8 — Other congenital malformations of breast[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• Q83.9 — Congenital malformation of breast, unspecified[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026

Change history

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

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 FY2026 tabular list, index and tables, effective October 1, 2025 Release, file and checksum · Publisher’s page

Claim edits Official source data

CMS Definitions of Medicare Code Edits — v43.1 (April 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 — v43 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 structured 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 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.

Labels on this page: Official source data · MedCoder structured relationship · MedCoder explanation. How to read the labels · All data sources and release dates

Nearest Codes in This Family

Official ICD-10-CM classifications closest to Q83.1 in its code family, with their registry titles.

• Q83 — Congenital malformations of breast
• Q83.0 — Congenital absence of breast with absent nipple
• Q83.2 — Absent nipple
• Q83.3 — Accessory nipple
• Q83.8 — Other congenital malformations of breast
• Q83.9 — Congenital malformation of breast, unspecified

View all codes in the Q83 family