ICDcodes.org
FY2027

N73.5 — Female pelvic peritonitis, unspecified

BillableUnspecified

Is N73.5 billable?

Yes, but N73.5 is an unspecified code. N73.5 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, N73.5 is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting N73.5 — the more specific alternatives are listed below.

N73.5 at a glance

CodeN73.5
DescriptionFemale pelvic peritonitis, unspecified
BillableYes
Code setICD-10-CM FY2027
Valid for encountersOctober 1, 2026 – September 30, 2027

Which MS-DRGs does N73.5 group to?

N73.5 sits in MDC 13 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.

  • 742Uterine and Adnexa Procedures for Non-Malignancy with CC/MCCsurgical
  • 743Uterine and Adnexa Procedures for Non-Malignancy without CC/MCCsurgical

How is N73.5 listed in the Alphabetic Index?

These are the routes through the Alphabetic Index that lead to N73.5. They show the wording a clinician may have documented, which often differs from the Tabular description.

  • Peritonitis › pelvic › female (adhesive) (bacterial) (fibrinous) (hemorrhagic) (idiopathic) (localized) (perforative) (primary) (with adhesions) (with effusion)

Excludes1 — never code together — inherited from N70-N77

The conditions below can never be reported together with N73.5 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

  • inflammatory diseases of female pelvic organs complicating:
  • abortion or ectopic or molar pregnancy (O00-O07, O08.0)
  • pregnancy, childbirth and the puerperium (O23.-, O75.3, O85, O86.-)

Use additional code — inherited from N73

Report an additional code alongside N73.5 to fully describe the condition. N73.5 is sequenced first.

  • code (B95-B97), to identify infectious agent.

Excludes2 — not included here — inherited from Chapter 14

The conditions below are not part of N73.5, but a patient may have both at the same time. When documentation supports it, N73.5 and the excluded code may both be reported.

  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Code also — inherited from N70-N77

Two codes may be needed to describe the condition fully. Whether N73.5 is sequenced first depends on the reason for the encounter.

  • , if applicable, pelvic abscess (K6A.0-)

How long has N73.5 existed?

N73.5 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.

Which codes are confused with N73.5?

ICD-10-CM declares these codes mutually exclusive with N73.5 — exactly one of each pair can be correct for a given encounter.

Which conditions are coded to N73.5?

What other codes are in the N73 family? (8)