ICD-10-CM 2027
ICD-10 code for Nephralgia
From the official ICD-10-CM alphabetic index entry “Nephralgia”. Page updated September 29, 2026.
About coding Nephralgia
The ICD-10-CM code for Nephralgia is N23 (Unspecified renal colic).
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 693 (Urinary Stones with MCC, relative weight 1.3168) and DRG 694 (Urinary Stones without MCC, relative weight 0.7815), 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.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Common questions about Nephralgia ICD-10 codes
What is the ICD-10 code for Nephralgia?
- N23 — Unspecified renal colic.
Is N23 billable?
- Yes. N23 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can N23 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict N23 as a principal diagnosis.
Is N23 a CC or MCC?
- No. N23 is neither a CC nor an MCC under MS-DRG v44.0.