2026 ICD-10-CM Diagnosis Code N99.4Postprocedural pelvic peritoneal adhesions

ICD-10-CM Codes›N00–N99›N99›N99

ICD-10-CM N99.4
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

N99.4 is a billable ICD-10-CM diagnosis code for postprocedural pelvic peritoneal adhesions. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 393 through 395. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Postprocedural or postoperative genitourinary system complication.

Code Identity

ICD-10-CM Code
N99.4
Billable Status
Yes — Valid for Submission
Code Describes
Postprocedural pelvic peritoneal adhesions
Short Description
Postprocedural pelvic peritoneal adhesions
Same as the full description in the CMS dataset.
Parent Code
N99
Intraoperative and postprocedural complications and disorders of genitourinary system, not elsewhere classified

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN99Intraoperative and postprocedural complications and disorders of genitourinary system, not elsewhere classified
CategoryN99Intraoperative and postprocedural complications and disorders of genitourinary system, not elsewhere classified
This CodeN99.4Postprocedural pelvic peritoneal adhesions

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Postprocedural pelvic peritoneal adhesions

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Type 2 Excludes

  • pelvic peritoneal adhesions NOS N73.6
  • postinfective pelvic peritoneal adhesions N73.6

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Adhesions, adhesive(postinfective)
      • pelvic (peritoneal)
        • female
          • postprocedural
    • Adhesions, adhesive(postinfective)
      • peritoneum, peritoneal (postinfective)
        • pelvic, female
          • postprocedural
    • Adhesions, adhesive(postinfective)
      • postoperative (gastrointestinal tract)
        • pelvic peritoneal
    • Complication(s) (from) (of)
      • genitourinary
        • postprocedural
          • pelvic peritoneal adhesions

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR GEN026
Postprocedural or postoperative genitourinary system complication
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Adhesions

Adhesions are bands of scar-like tissue. Normally, internal tissues and organs have slippery surfaces so they can shift easily as the body moves. Adhesions cause tissues and organs to stick together. They might connect the loops of the intestines to each other, to nearby organs, or to the wall of the abdomen.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert N99.4 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
568.0 Peritoneal adhesions
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About N99.4Overview

Is N99.4 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report postprocedural pelvic peritoneal adhesions on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does N99.4 group to?

When postprocedural pelvic peritoneal adhesions is the principal diagnosis on an inpatient stay, it groups to MS-DRG 393, 394, 395, with relative weights from 0.6490 to 1.5993 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of N99.4?

Under the General Equivalence Mappings, postprocedural pelvic peritoneal adhesions converts to ICD-9-CM 568.0 (peritoneal adhesions). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.