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S36.81 vs S37.812

S36.81 (Injury of peritoneum) compared with S37.812 (Contusion of adrenal gland), 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 S37.812 lists S36.81 under Excludes2, which marks them as distinct conditions.

Official rule
What is different?

The conditions named.S36.81 is “Injury of peritoneum”; S37.812 is “Contusion of adrenal gland”.

Registry fact

Can these codes be reported together?

Yes, when both are documented.S37.812 lists S36.81 under Excludes2: “injury of peritoneum (S36.81)”. 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. S37.812 carries 1 Excludes1 note covering other codes; the side-by-side table quotes them.

Official rule

Is there an Excludes2 relationship?

Yes.S37.812’s tabular entry: “injury of peritoneum (S36.81)”. The note covers S36.81.

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?

Both are headers.Both are non-billable headers, 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

S37.812
Contusion of adrenal gland
↔
S36.81
Injury of peritoneum

What we found

Yes, when both are documented.S37.812 carries an Excludes2 note covering S36.81: “injury of peritoneum (S36.81)”

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
S36.81

Injury of peritoneum

S37.812

Contusion of adrenal gland

StatusDiffers
S36.81
Non-billable header

A header is not reported on a claim; a code beneath it is.

Report instead: S36.81XA, S36.81XD, S36.81XS

S37.812
Non-billable header

A header is not reported on a claim; a code beneath it is.

Report instead: S37.812A, S37.812D, S37.812S

Excludes1Differs
S36.81

None at this code

S37.812
  • obstetric trauma to pelvic organs (O71.-)
Excludes2Differs
S36.81
  • burns and corrosions (T20-T32)
  • effects of foreign body in anus and rectum (T18.5)
  • effects of foreign body in genitourinary tract (T19.-)
  • effects of foreign body in stomach, small intestine and colon (T18.2-T18.4)
  • frostbite (T33-T34)
  • insect bite or sting, venomous (T63.4)
S37.812
  • injury of peritoneum (S36.81)
  • injury of retroperitoneum (S36.89-)
  • burns and corrosions (T20-T32)
  • effects of foreign body in anus and rectum (T18.5)
  • effects of foreign body in genitourinary tract (T19.-)
  • effects of foreign body in stomach, small intestine and colon (T18.2-T18.4)
  • frostbite (T33-T34)
  • insect bite or sting, venomous (T63.4)
Code alsoSame for both
  • any associated open wound (S31.-)
CategoryDiffers
S36.81

S36 Injury of intra-abdominal organs

S37.812

S37 Injury of urinary and pelvic organs

ChapterSame for both

S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)

IncludesSame for both
  • injuries to the abdominal wall
  • injuries to the anus
  • injuries to the buttock
  • injuries to the external genitalia
7th characterDiffers
S36.81
  • The appropriate 7th character is to be added to each code from category S36
S37.812
  • The appropriate 7th character is to be added to each code from category S37

No Code first and Use additional code 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.

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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