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ICD-10-CM 2027

ICD-10 code for aseptic peritonitis

T81.61

Aseptic peritonitis due to foreign substance accidentally left during a procedure

Header — needs a more specific code

From the official ICD-10-CM alphabetic index entry “Peritonitis (adhesive) (bacterial) (fibrinous) (hemorrhagic) (idiopathic) (localized) (perforative) (primary) (with adhesions) (with effusion) › aseptic”. Page updated September 29, 2026.

About coding aseptic peritonitis

The ICD-10-CM code for aseptic peritonitis is T81.61 (Aseptic peritonitis due to foreign substance accidentally left during a procedure).

Within T81.6 (acute reaction to foreign substance accidentally left during a procedure), T81.61 is specifically for aseptic peritonitis due to foreign substance accidentally left during a procedure. Related codes cover unspecified acute reaction to foreign substance accidentally left during a procedure (T81.60) and other acute reaction to foreign substance accidentally left during a procedure (T81.69).

Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.

Use an additional code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5).

Common questions about aseptic peritonitis ICD-10 codes

What is the ICD-10 code for aseptic peritonitis?

T81.61 — Aseptic peritonitis due to foreign substance accidentally left during a procedure (a header code; report a more specific subcode).

Is T81.61 billable?

No. T81.61 is a header code. Report one of its more specific subcodes instead.