Skip to main content

L02.231 vs N61.1

L02.231 (Carbuncle of abdominal wall) compared with N61.1 (Abscess of the breast and nipple), from the official CMS tabular data.

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

Summary

These codes can be reported together when both conditions are documented, because L02.231 lists N61.1 under Excludes2, which marks them as distinct conditions.

Official rule
What is different?

The conditions named and chapter.L02.231 is “Carbuncle of abdominal wall”; N61.1 is “Abscess of the breast and nipple”. L02.231 sits in L00-L99 — Diseases of the Skin and Subcutaneous Tissue (L00-L99); N61.1 in N00-N99 — Diseases of the Genitourinary System (N00-N99).

Registry fact

Can these codes be reported together?

Yes, when both are documented.L02.231 lists N61.1 under Excludes2: “abscess of breast (N61.1)”. Excludes2 marks distinct conditions that may both be reported when both are documented.

Official ruleGuide: Excludes1 vs Excludes2

Is there an Excludes1 relationship?

None.Neither entry carries an Excludes1 note that names the other code. L02.231 carries 2 Excludes1 notes and N61.1 carries 5 Excludes1 notes covering other codes; the side-by-side table quotes them.

Official rule

Is there an Excludes2 relationship?

Yes.L02.231’s tabular entry: “abscess of breast (N61.1)”. The note covers N61.1.

Official ruleGuide: Excludes1 vs Excludes2

Is one more specific?

Not comparable.The codes sit in different categories; specificity is only comparable within one category.

Is one a parent or header code?

No.Both are billable codes, and neither contains the other.

Registry fact

Are there sequencing instructions?

None.Neither entry carries a Code First or Use Additional Code note that names the other.

Official rule

Are there other coding relationships?

None found.No laterality, encounter-phase, Table of Neoplasms, Table of Drugs and Chemicals, or history-versus-active-disease relationship links these codes.

MedCoder-derived

Official rule: a tabular instructional note or a section of the ICD-10-CM Official Guidelines, quoted as published. Registry fact: the codes’ own published attributes (titles, billable status, position in the hierarchy, code set). MedCoder-derived: a reading MedCoder computes from those facts; it is not itself a rule. How to read the labels

Can these codes be reported together?

Informational

Excludes2 relationship

L02.231
Carbuncle of abdominal wall
↔
N61.1
Abscess of the breast and nipple

What we found

Yes, when both are documented.L02.231 carries an Excludes2 note covering N61.1: “abscess of breast (N61.1)”

Excludes2 marks distinct conditions — both may be reported when both are documented.

What to review

Report both only when the documentation supports both conditions; otherwise report the one documented.

Guide: Excludes1 vs Excludes2Check these on a claim

Why it matters

An Excludes2 note means the excluded condition is not part of the code above it, but a patient can have both. Report both when both are documented.

Source / rule

CMS ICD-10-CM tabular instructional notes

Official guidance behind these answers

  • Section I.A.12.b — Excludes2 · applies to: Excludes2

    A type 2 Excludes note represents “Not included here.” An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.

    ICD-10-CM Official Guidelines FY2027

Quoted from the ICD-10-CM Official Guidelines for Coding and Reporting in effect for the release shown. The tabular notes above are the code-level instruction; these sections are the convention that says how such a note is applied. Source document (CMS PDF) · Release and checksum

Side by side

Similar descriptions do not make codes interchangeable. The documentation and the official instructions decide which code applies.

Official descriptionDiffers
L02.231

Carbuncle of abdominal wall

N61.1

Abscess of the breast and nipple

StatusSame for both
Billable
Excludes1Differs
L02.231
  • non-newborn omphalitis (L08.82)
  • omphalitis of newborn (P38.-)
N61.1
  • inflammatory carcinoma of breast (C50.A-)
  • inflammatory disorder of breast associated with childbirth (O91.-)
  • neonatal infective mastitis (P39.0)
  • thrombophlebitis of breast [Mondor's disease] (I80.8)
  • disorders of breast associated with childbirth (O91-O92)
Excludes2Differs
L02.231
  • abscess of breast (N61.1)
  • abscess of buttocks (L02.31)
  • abscess of female external genital organs (N76.4)
  • abscess of male external genital organs (N48.2, N49.-)
  • abscess of hip (L02.4)
  • abscess of anus and rectal regions (K61.-)
  • abscess of female genital organs (external) (N76.4)
  • abscess of male genital organs (external) (N48.2, N49.-)
  • hordeolum (H00.0)
  • infective dermatitis (L30.3)
  • local infections of skin classified in Chapter 1
  • lupus panniculitis (L93.2)
  • panniculitis NOS (M79.3)
  • panniculitis of neck and back (M54.0-)
  • Perlèche NOS (K13.0)
  • Perlèche due to candidiasis (B37.0)
  • Perlèche due to riboflavin deficiency (E53.0)
  • pyogenic granuloma (L98.0)
  • relapsing panniculitis [Weber-Christian] (M35.6)
  • viral warts (B07.-)
  • zoster (B02.-)
N61.1

None at this code

Use additional codeDiffers
L02.231
  • code to identify organism (B95-B96)
  • code (B95-B97) to identify infectious agent.
N61.1

None at this code

CategoryDiffers
L02.231

L02 Cutaneous abscess, furuncle and carbuncle

N61.1

N61 Inflammatory disorders of breast

ChapterDiffers
L02.231

L00-L99 — Diseases of the Skin and Subcutaneous Tissue (L00-L99)

N61.1

N00-N99 — Diseases of the Genitourinary System (N00-N99)

IncludesDiffers
L02.231

None at this code

N61.1
  • Abscess (acute) (chronic) (nonpuerperal) of areola
  • Abscess (acute) (chronic) (nonpuerperal) of breast
  • Carbuncle of breast
  • Mastitis with abscess

No Code first, Code also and 7th character note at either code.

Notes are the code’s own tabular entry, quoted as published. A note that names the other code is the one the verdict above rests on. In a row that differs, notes every code shares are dimmed.

Edit this comparisonCheck a whole claim

Derived from the official CMS ICD-10-CM tabular data (FY2027). A coding-rule comparison, not billing advice: payer-specific edits and medical-necessity policy are outside its scope. All data sources