2027 ICD-10-CM Diagnosis Code N99.528Other complication of incontinent external stoma of urinary tract

ICD-10-CM Codes›N00–N99›N99›N99

ICD-10-CM N99.528
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

N99.528 is a billable ICD-10-CM diagnosis code for other complication of incontinent external stoma of urinary tract. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 698 through 700, 791, 793. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Postprocedural or postoperative genitourinary system complication.

N99.528 no longer risk-adjusts for Medicare Advantage: it mapped to HCC 176 under the retired CMS-HCC V24 model through payment year 2025 but maps to no category in the live V28 model. It still risk-adjusts in the PACE (CMS-HCC V22) category 176, ESRD (V21) category 176, and ESRD (V24) category 176 for payment year 2027.

Code Identity

ICD-10-CM Code
N99.528
Billable Status
Yes — Valid for Submission
Code Describes
Other complication of incontinent external stoma of urinary tract
Short Description
Other comp of incontinent external stoma of urinary tract
Parent Code
N99.52
Complication of incontinent external stoma of urinary tract

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 CodeN99.528Other complication of incontinent external stoma of urinary tract

Medicare Risk Adjustment (HCC)Billing

N99.528 no longer risk-adjusts for Medicare Advantage: it maps to no payment category in the live CMS-HCC V28 model, although it still risk-adjusts in the other CMS models shown below.

CMS-HCC V28 (Medicare Advantage Payment Model)
Not mapped
Dropped in V28 see all codes that no longer risk-adjust
Prior Model (CMS-HCC V24)
HCC 176
V24 retired last contributed to a Medicare Advantage risk score in payment year 2025
Other CMS Models
PACE (CMS-HCC V22): HCC 176 · ESRD (V21): HCC 176 · ESRD (V24): HCC 176
ESRD V21 weights: 0.000 dialysis, 0.599 functioning graft · ESRD V24 weights: 0.000 dialysis, 0.586–1.017 functioning graft
Part D (RxHCC)
Not mapped
N99.528 does not risk-adjust in the RxHCC prescription drug model

Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Chronic contact dermatitis
  • Chronic irritant contact dermatitis
  • Chronic papillomatous dermatitis due to urostomy
  • Complication of external stoma of urinary tract
  • Dermatosis resulting from ureterostomy
  • Disorder of urological stoma
  • Disorder of urological stoma following surgical procedure
  • Irritant contact dermatitis due to stoma
  • Irritant contact dermatitis due to urostomy
  • Parastomal hernia
  • Parastomal urostomy hernia
  • Peristomal dermatitis
  • Peristomal skin complication
  • Stomal prolapse
  • Urostomy stomal prolapse

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to N99.528: its own notes plus those printed at N99.5, 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.

From N99.5 Complications of stoma of urinary tract applies to 16 codes
  • mechanical complication of urinary catheter (T83.0-)
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 N99.528, its category, or a range that includes it.

Excludes1 2

These codes carry an Excludes1 note naming N99.528: they are not reported together with it, unless the two conditions are unrelated.

  • Z43 Encounter for attention to artificial openings
    complications of external stoma (J95.0-, K94.-, N99.5-) names N99.5-, which includes this code
  • Z93 Artificial opening status
    complications of external stoma (J95.0-, K94.-, N99.5-) names N99.5-, which includes this code

Excludes2 6

These codes carry an Excludes2 note naming N99.528: its condition is not part of those codes, and both may be reported when the patient has both.

  • 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
  • Block T80-T88 Complications of surgical and medical care, not elsewhere classified
    ostomy complications (J95.0-, K94.-, N99.5-) names N99.5-, 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
  • T81 Complications of procedures, not elsewhere classified
    ostomy complications (J95.0-, K94.-, N99.5-) names N99.5-, which includes this code
  • T83.0 Mechanical complication of urinary catheter
    complications of stoma of urinary tract (N99.5-) names N99.5-, which includes this code
  • T83.51 Infection and inflammatory reaction due to urinary catheter
    complications of stoma of urinary tract (N99.5-) names N99.5-, 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

Ostomy

An ostomy is surgery to create an opening (stoma) from an area inside the body to the outside. It treats certain diseases of the digestive or urinary systems. It can be permanent, when an organ must be removed. It can be temporary, when the organ needs time to heal. The organ could be the small intestine, colon, rectum, or bladder.

Read the full article at MedlinePlus

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

Convert N99.528 to ICD-9-CMHistory

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

ICD-9-CM
997.5 Surg compl-urinary tract
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 N99.528Overview

What is the ICD-10 code for other complication of incontinent external stoma of urinary tract?

The ICD-10-CM code for other complication of incontinent external stoma of urinary tract is N99.528 (sometimes written as N99528). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is N99.528 (Complication of incontinent external stoma of urinary tract) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other complication of incontinent external stoma of urinary tract on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does N99.528 group to?

When other complication of incontinent external stoma of urinary tract is the principal diagnosis on an inpatient stay, it groups to MS-DRG 793, 791, 699, 698, 700, with relative weights from 0.6740 to 4.2192 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of N99.528?

Under the General Equivalence Mappings, other complication of incontinent external stoma of urinary tract converts to ICD-9-CM 997.5 (surg compl-urinary tract). The mapping is approximate, so confirm the match fits the documentation.

Does N99.528 risk-adjust for Medicare Advantage payment?

Not for Medicare Advantage. N99.528 mapped to HCC 176 in the retired CMS-HCC V24 model, which last determined payment in 2025, but it maps to no category in the live V28 model; see all codes that no longer risk-adjust. It still risk-adjusts in the PACE (CMS-HCC V22) category 176 (Complications of Specified Implanted Device or Graft), ESRD (V21) category 176 (Complications of Specified Implanted Device or Graft), and ESRD (V24) category 176 (Complications of Specified Implanted Device or Graft).