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ICD-10-CM 2027 diagnosis code

N99.4Postprocedural pelvic peritoneal adhesions

✓ Billable / specific

N99.4 is a valid, billable ICD-10-CM code for postprocedural pelvic peritoneal adhesions. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About N99.4

N99.4 is the ICD-10-CM diagnosis code for postprocedural pelvic peritoneal adhesions. It belongs to category N99 (intraoperative and postprocedural complications and disorders of genitourinary system, not elsewhere classified), block N99 (intraoperative and postprocedural complications and disorders of genitourinary system, not elsewhere classified) and chapter 14 (diseases of the genitourinary system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within N99 (intraoperative and postprocedural complications and disorders of genitourinary system, not elsewhere classified), N99.4 is specifically for postprocedural pelvic peritoneal adhesions. Related codes cover postprocedural (acute) (chronic) kidney failure (N99.0), postprocedural urethral stricture (N99.1), postprocedural adhesions of vagina (N99.2), prolapse of vaginal vault after hysterectomy (N99.3), complications of stoma of urinary tract (N99.5), intraoperative hemorrhage and hematoma of a genitourinary system organ or structure complicating a procedure (N99.6), accidental puncture and laceration of a genitourinary system organ or structure during a procedure (N99.7) and other intraoperative and postprocedural complications and disorders of genitourinary system (N99.8).

The conditions in its Excludes2 note aren't part of N99.4, but may be coded alongside it if the patient has both: pelvic peritoneal adhesions NOS (N73.6) and postinfective pelvic peritoneal adhesions (N73.6).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 393 (Other Digestive System Diagnoses with MCC, relative weight 1.5881), DRG 394 (Other Digestive System Diagnoses with CC, relative weight 0.9228) and DRG 395 (Other Digestive System Diagnoses without CC/MCC, relative weight 0.6382), in MDC 06 (Diseases and Disorders of the Digestive System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 568.0 (peritoneal adhesions (postoperative) (postinfection)).

Coding notes

Excludes2Not included here — may be reported together if both conditions exist
  • pelvic peritoneal adhesions NOS (N73.6)
  • postinfective pelvic peritoneal adhesions (N73.6)

Notes that apply from higher levels

Instructions written at a parent level also apply to N99.4.

› From N99 Intraoperative and postprocedural complications and disorders of genitourinary system, not elsewhere classified
Excludes2
  • irradiation cystitis (N30.4-)
  • postoophorectomy osteoporosis with current pathological fracture (M80.8-)
  • postoophorectomy osteoporosis without current pathological fracture (M81.8)

Broader instructions also apply from Chapter 14: Diseases of the genitourinary system.

Alphabetic index entries

4 entries

Terms in the official ICD-10-CM index that lead to N99.4.

Codes whose notes reference N99.4

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

ICD-9-CM equivalent

Converter →
  • 568.0Peritoneal adhesions (postoperative) (postinfection)approximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about N99.4

Is N99.4 billable?

Yes. N99.4 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can N99.4 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict N99.4 as a principal diagnosis.

Is N99.4 a CC or MCC?

No. N99.4 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does N99.4 group to?

N99.4 is used in the MS-DRG v44.0 logic for MS-DRG 393 (Other Digestive System Diagnoses with MCC), MS-DRG 394 (Other Digestive System Diagnoses with CC) and MS-DRG 395 (Other Digestive System Diagnoses without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for N99.4?

The CMS General Equivalence Mappings map N99.4 to ICD-9-CM 568.0.