ICD-10-CM 2027
ICD-10 code for kidney compensatory hypertrophy
From the official ICD-10-CM alphabetic index entry “Hypertrophy, hypertrophic › kidney (compensatory)”. Page updated September 29, 2026.
About coding kidney compensatory hypertrophy
The ICD-10-CM code for kidney compensatory hypertrophy is N28.81 (Hypertrophy of kidney). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on N28.81.
Within N28.8 (other specified disorders of kidney and ureter), N28.81 is specifically for hypertrophy of kidney. Related codes cover Megaloureter (N28.82), Nephroptosis (N28.83), Pyelitis cystica (N28.84), Pyeloureteritis cystica (N28.85), Ureteritis cystica (N28.86) and other specified disorders of kidney and ureter (N28.89).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 698 (Other Kidney and Urinary Tract Diagnoses with MCC, relative weight 1.6398), DRG 699 (Other Kidney and Urinary Tract Diagnoses with CC, relative weight 1.0003) and DRG 700 (Other Kidney and Urinary Tract Diagnoses without CC/MCC, relative weight 0.6741), in MDC 11 (Diseases and Disorders of the Kidney and Urinary Tract), 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 kidney compensatory hypertrophy codes (official index)
- congenital Q63.3 — Hyperplastic and giant kidney
Common questions about kidney compensatory hypertrophy ICD-10 codes
What is the ICD-10 code for kidney compensatory hypertrophy?
- N28.81 — Hypertrophy of kidney. More specific codes apply when the documentation supports them: Q63.3.
What is the ICD-10 code for congenital kidney compensatory hypertrophy?
- Q63.3 — Hyperplastic and giant kidney.
Is N28.81 billable?
- Yes. N28.81 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can N28.81 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict N28.81 as a principal diagnosis.
Is N28.81 a CC or MCC?
- No. N28.81 is neither a CC nor an MCC under MS-DRG v44.0.