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ICD-10-CM 2027 diagnosis code

N99.51Complication of cystostomy

Not billable — use a more specific code

N99.51 is a header code, so it can't be reported by itself. Choose one of the 4 more specific codes beneath it.

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 N99.51

N99.51 is the ICD-10-CM diagnosis code for complication of cystostomy. 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 a header code, so it can't be reported by itself; one of its 4 subcodes must be used instead.

Within N99.5 (complications of stoma of urinary tract), N99.51 is specifically for complication of cystostomy. Related codes cover incontinent external stoma of urinary tract (N99.52) and continent stoma of urinary tract (N99.53).

To report this condition, pick the subcode that matches the documentation: N99.510 (hemorrhage), N99.511 (infection), N99.512 (malfunction) and N99.518 (complication).

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

Specific codes under N99.51

Notes that apply from higher levels

Instructions written at a parent level also apply to N99.51.

› From N99.5 Complications of stoma of urinary tract
Excludes2
  • mechanical complication of urinary catheter (T83.0-)
› 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.

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 N99.51

Is N99.51 billable?

No. N99.51 is a header code. Report one of its more specific subcodes instead.