ICD-10-CM 2027 diagnosis code
N23Unspecified renal colic
N23 is a valid, billable ICD-10-CM code for unspecified renal colic. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.
Looking up by condition? See ICD-10 code for Nephralgia, ICD-10 code for Ureteralgia.
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 N23
N23 is the ICD-10-CM diagnosis code for unspecified renal colic. It belongs to block N20-N23 (Urolithiasis) and chapter 14 (diseases of the genitourinary system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.
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.
Before ICD-10, this condition was coded in ICD-9-CM as 788.0 (renal colic).
Notes that apply from higher levels
Instructions written at a parent level also apply to N23.
Broader instructions also apply from Chapter 14: Diseases of the genitourinary system.
Alphabetic index entries
9 entriesTerms in the official ICD-10-CM index that lead to N23.
- Colic (bilious) (infantile) (intestinal) (recurrent) (spasmodic) › kidney
- Colic (bilious) (infantile) (intestinal) (recurrent) (spasmodic) › nephritic
- Colic (bilious) (infantile) (intestinal) (recurrent) (spasmodic) › renal
- Colic (bilious) (infantile) (intestinal) (recurrent) (spasmodic) › ureter
- Nephralgia
- Pain (s) › kidney
- Pain (s) › ureter
- Pain (s) › urinary (organ) (system)
- Ureteralgia
Codes whose notes reference N23
MS-DRG v44.0 grouping
All DRGs →Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.
MDC 11 · Diseases and Disorders of the Kidney and Urinary Tract
ICD-9-CM equivalent
Converter →- 788.0Renal colicexact
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about N23
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.
What DRG does N23 group to?
- N23 is used in the MS-DRG v44.0 logic for MS-DRG 693 (Urinary Stones with MCC) and MS-DRG 694 (Urinary Stones without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.
What is the ICD-9 code for N23?
- The CMS General Equivalence Mappings map N23 to ICD-9-CM 788.0.