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N99.861 ICD-10-CM Code: Intraoperative and postprocedural nipple necrosis

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

Coding at a Glance

Tabular directives
3 Excludes2

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.

Excludes2Not included here; may be reported together
  • irradiation cystitis (N30.4-)
  • postoophorectomy osteoporosis with current pathological fracture (M80.8-)
  • postoophorectomy osteoporosis without current pathological fracture (M81.8)

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 600 — NON-MALIGNANT BREAST DISORDERS WITH CC/MCC (MDC 09)
  • MS-DRG 601 — NON-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.

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for N99.861 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 N99.861 itself; “inherited from” names the category or block whose note applies here.

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

Source: inherited from N99

Coder workflow for N99.861

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 N99.861(3 notes)

    Coding workflow: The conditions named in this note are not included in N99.861. When the record documents both, both may be reported; the note is a boundary, not a prohibition.

    CompareN30.4, M80.8, M81.8

    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.

Don’t confuse N99.861 with…

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

The codes most likely to be picked instead of N99.861 — 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.

  • N30.4— 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 irradiation cystitis adds N30.4; it is not part of this code and both may be reported when both are documented.

    Full comparison: N99.861 vs N30.4 →

  • M80.8— 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 postoophorectomy osteoporosis with current pathological fracture adds M80.8; it is not part of this code and both may be reported when both are documented.

    Full comparison: N99.861 vs M80.8 →

  • M81.8— 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 postoophorectomy osteoporosis without current pathological fracture adds M81.8; it is not part of this code and both may be reported when both are documented.

    Full comparison: N99.861 vs M81.8 →

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

Intraoperative and postprocedural nipple necrosis is a billable ICD-10-CM diagnosis code (N99.861).

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

  • 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 N99.861 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 10 Excludes2 notes: T80 — Complications following infusion, transfusion and therapeutic injection (via N99.-), T80-T88 — Complications of surgical and medical care, not elsewhere classified (T80-T88) (via N99.-), T81 — Complications of procedures, not elsewhere classified (via N99.-), T82 — Complications of cardiac and vascular prosthetic devices, implants and grafts (via N99.-), T83 — Complications of genitourinary prosthetic devices, implants and grafts (via N99.-), T84 — Complications of internal orthopedic prosthetic devices, implants and grafts (via N99.-), T85 — Complications of other internal prosthetic devices, implants and grafts (via N99.-), T86 — Complications of transplanted organs and tissue (via N99.-), T87 — Complications peculiar to reattachment and amputation (via N99.-), T88 — Other complications of surgical and medical care, not elsewhere classified (via N99.-).

These codes’ tabular lists name this diagnosis as distinct — both may be reported when both are documented.

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 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.

Related Codes

Same Index main term, other category

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

M87.9 — Osteonecrosis, unspecified (bone), N17.0 — Acute kidney failure with tubular necrosis (tubular), N17.1 — Acute kidney failure with acute cortical necrosis (cortical), N17.2 — Acute kidney failure with medullary necrosis (medullary), N17.9 — Acute kidney failure, unspecified (kidney, acute), N28.0 — Ischemia and infarction of kidney (kidney), N32.89 — Other specified disorders of bladder (bladder), N50.89 — Other specified disorders of the male genital organs (testis), N64.1 — Fat necrosis of breast (breast), N70.92 — Oophoritis, unspecified (ovary), N89.8 — Other specified noninflammatory disorders of vagina (vagina), N90.89 — Other specified noninflammatory disorders of vulva and perineum (vulva), O08.4 — Renal failure following ectopic and molar pregnancy (kidney, tubular, with ectopic or molar pregnancy), O99.285 — Endocrine, nutritional and metabolic diseases complicating the puerperium (pituitary, Sheehan), P15.6 — Subcutaneous fat necrosis due to birth injury (fat, fatty, subcutaneous, due to birth injury), P83.0 — Sclerema neonatorum (fat, fatty, skin, newborn), P83.88 — Other specified conditions of integument specific to newborn (subcutaneous fat, newborn), T79.5 — Traumatic anuria (kidney, tubular, traumatic), T87.5 — Necrosis of amputation stump (amputation stump, arm), T87.50 — Necrosis of amputation stump, unspecified extremity (amputation stump), +34 more

Contextual Map

Every relationship of N99.861 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 N99.861 with these 8 related codes in Claim Check

Hierarchy

Referenced by Excludes2 notes (10)

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

Index entries

  • Necrosis, necrotic (ischemic), nipple, intraoperative and postprocedural[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027

Nearest codes (40)

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.

Indexed Clinical Terms (1)

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.

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
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. "N99.861 — Intraoperative and postprocedural nipple necrosis." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/n99.861-intraoperative-and-postprocedural-nipple-necrosis

Change history

Changed in FY2027, the release in force: Added to the code set.

  • FY2027 — October 1, 2026
    Added to the code set
    Intraoperative and postprocedural nipple necrosis
    FY2027 changes

Nearest Codes in This Family

Official ICD-10-CM classifications closest to N99.861 in its code family, with their registry titles.

View all codes in the N99 family