ICD-10-CM 2027
ICD-10 code for retroperitoneal fibrosis
From the official ICD-10-CM alphabetic index entry “Fibrosis, fibrotic › retroperitoneal”. Page updated September 29, 2026.
About coding retroperitoneal fibrosis
The ICD-10-CM code for retroperitoneal fibrosis is K68.2 (Retroperitoneal fibrosis). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on K68.2.
Within K68 (disorders of retroperitoneum), K68.2 is specifically for retroperitoneal fibrosis. Related codes cover retroperitoneal abscess (K68.1), retroperitoneal hematoma (K68.3) and other disorders of retroperitoneum (K68.9).
As a secondary diagnosis it is an MCC (major complication or comorbidity), which can move an inpatient stay into the highest-paying "with MCC" MS-DRG of its family, unless the principal diagnosis excludes it.
In MS-DRG v44.0, it is part of the grouping logic for DRG 371 (Major Gastrointestinal Disorders and Peritoneal Infections with MCC, relative weight 1.7089), DRG 372 (Major Gastrointestinal Disorders and Peritoneal Infections with CC, relative weight 0.9964), DRG 373 (Major Gastrointestinal Disorders and Peritoneal Infections without CC/MCC, relative weight 0.6941), DRG 791 (Prematurity with Major Problems, relative weight 4.1075) and DRG 793 (Full Term Neonate with Major Problems, relative weight 4.2195), in MDC 06 (Diseases and Disorders of the Digestive System) and MDC 15 (Newborns and Other Neonates with Conditions Originating in the Perinatal Period), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific retroperitoneal fibrosis codes (official index)
Common questions about retroperitoneal fibrosis ICD-10 codes
What is the ICD-10 code for retroperitoneal fibrosis?
- K68.2 — Retroperitoneal fibrosis. More specific codes apply when the documentation supports them: N13.6, N13.5.
What is the ICD-10 code for idiopathic retroperitoneal fibrosis?
- N13.5 — Crossing vessel and stricture of ureter without hydronephrosis.
Is K68.2 billable?
- Yes. K68.2 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can K68.2 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict K68.2 as a principal diagnosis.
Is K68.2 a CC or MCC?
- K68.2 is an MCC (major complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.