2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

N99.4 is a billable ICD-10-CM diagnosis code for postprocedural pelvic peritoneal adhesions. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) 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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to N99.4: its own notes plus those printed at N99 and Chapter 14. A note printed at a category, block or chapter applies to every code under it.

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

On N99.4 itself
  • pelvic peritoneal adhesions NOS (N73.6)
  • postinfective pelvic peritoneal adhesions (N73.6)
From N99 Intraoperative and postprocedural complications and disorders of genitourinary system, not elsewhere classified applies to 44 codes
  • irradiation cystitis (N30.4-)
  • postoophorectomy osteoporosis with current pathological fracture (M80.8-)
  • postoophorectomy osteoporosis without current pathological fracture (M81.8)
From Chapter 14 (N00-N99) Diseases of the genitourinary system applies to 838 codes
  • 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)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name N99.4, its category, or a range that includes it.

Excludes2 4

These codes carry an Excludes2 note naming N99.4: its condition is not part of those codes, and both may be reported when the patient has both.

  • K66.0 Peritoneal adhesions (postprocedural) (postinfection)
    female pelvic postprocedural adhesions (N99.4)
  • N73.6 Female pelvic peritoneal adhesions (postinfective)
    postprocedural pelvic peritoneal adhesions (N99.4)
  • Block T80-T88 Complications of surgical and medical care, not elsewhere classified
    intraoperative and postprocedural complications of specified body systems (D78.-, E36.-, E89.-, G97.3-, G97.4, H59.3-, H59.-, H95.2-, H95.3, I97.4-, I97.5, J95.6-, J95.7, K91.6-, L76.-, M96.-, N99.-) names N99.-, which includes this code
  • T81 Complications of procedures, not elsewhere classified
    intraoperative and postprocedural complications of specific body system (D78.-, E36.-, E89.-, G97.3-, G97.4, H59.3-, H59.-, H95.2-, H95.3, I97.4-, I97.5, J95, K91.-, L76.-, M96.-, N99.-) names N99.-, which includes this code

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About N99.4Overview

What is the ICD-10 code for postprocedural pelvic peritoneal adhesions?

The ICD-10-CM code for postprocedural pelvic peritoneal adhesions is N99.4 (sometimes written as N994). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

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 394, 395, 393, with relative weights from 0.6379 to 1.5877 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.