2026 ICD-10-CM Diagnosis Code N23Unspecified renal colic

ICD-10-CM Codes›N00–N99›N20-N23›N23

ICD-10-CM N23
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

N23 is a billable ICD-10-CM diagnosis code for unspecified renal colic. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 693 through 694. Coders also document this condition as finding of sensation of kidney.

Code Identity

ICD-10-CM Code
N23
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified renal colic
Chapter
N20-N23
Urolithiasis

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN20-N23Urolithiasis
CategoryN23Unspecified renal colic
This CodeN23Unspecified renal colic

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • 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

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Finding of sensation of kidney
  • Finding of sensation of kidney
  • Finding of sensation of kidney
  • Renal angle pain
  • Renal colic
  • Renal pain
  • Tenderness of kidney
  • Ureteric colic
  • Ureteric pain
  • Urinary tract tenderness

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR GEN006
Other specified and unspecified diseases of kidney and ureters
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Renal Colic

    a severe intermittent and spasmodic pain in the lower back radiating to the groin, scrotum, and labia which is most commonly caused by a kidney stone (renal calculus) passing through the ureter or by other urinary track blockage. it is often associated with nausea, vomiting, fever, restlessness, dull pain, frequent urination, and hematuria.

Patient EducationClinical

Kidney Stones

A kidney stone is a solid piece of material that forms in the kidney from substances in the urine. It may be as small as a grain of sand or as large as a pearl. Most kidney stones pass out of the body without help from a doctor. But sometimes a stone will not go away.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert N23 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

Renal colic

ICD-9-CM: 788.0

This is a direct match with no additional mapping qualifiers. The absence of a flag generally means the mapping is considered exact or precise. In other words, the ICD-10 code maps cleanly to the ICD-9 code without qualification, approximation, or needing multiple codes.

View Conversion

Code HistoryHistory

  • FY 2026 - No Change, effective from 10/1/2025 through 9/30/2026
  • FY 2025 - No Change, effective from 10/1/2024 through 9/30/2025
  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.