Calculus of urinary tract in diseases classified elsewhere
In Urolithiasis (N20-N23), chapter 14: Diseases of the Genitourinary System
- N22 is billable and valid on claims for FY 2027. If the record has more detail, check the other codes under N20-N23 below.
- As a secondary diagnosis it is not a CC or MCC, so it doesn't raise the MS-DRG payment.
- Doesn't count toward a Medicare Advantage risk score (no HCC in V28).
- AHRQ's Chronic Condition Indicator classes it as not chronic (an acute or short-term condition).
- Can't be the principal diagnosis: code the underlying condition first. (Manifestation list)
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Instructional notes
Code first: code the underlying condition first, then this code
- underlying disease, such as:
- gout (M1A.-, M10.-)
- schistosomiasis (B65.0-B65.9)
Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Covers chronic kidney disease staging, CKD in kidney transplant patients, and sequencing CKD with related conditions such as diabetes and hypertension.
- Chronic kidney disease (page 62)
Other codes under N20-N23
Urolithiasis (N20-N23)
- N20Calculus of kidney and ureter
- N21Calculus of lower urinary tract
- N22Calculus of urinary tract in diseases classified elsewhere(this code)
- N23Unspecified renal colic
N22 MS-DRGs
As the principal diagnosis, N22 groups to MS-DRG 693 or 694 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.
Related conditions
Grouped by AHRQ's Clinical Classifications Software Refined (CCSR), which sorts every diagnosis code into clinically meaningful categories.
N22 is in Calculus of urinary tract (GEN005), with 10 codes. Others in it:
Medicare coverage articles listing N22
These 3 Medicare billing and coding articles list N22 as a diagnosis that supports medical necessity for the services they cover. From the CMS Medicare Coverage Database; check your own contractor's article before billing.
Other codes that refer to N22
Notes on these codes point to N22.
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
Bladder Diseases
The bladder is a hollow organ in your lower abdomen that stores urine. Many conditions can affect your bladder. Some common ones are: Doctors diagnose bladder diseases using different tests. These include urine tests, x-rays, and an examination of the bladder wall with a scope called a cystoscope. Treatment depends on the cause of the problem. It may include medicines and, in severe cases, surgery.
Read more about bladder diseases on MedlinePlusKidney 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. It may get stuck in the urinary tract, block the flow of urine and cause great pain.
Read more about kidney stones on MedlinePlusCode history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.
ICD-9-CM equivalent
Legacy crosswalk from the CMS General Equivalence Mappings (last updated 2018).
- 592.9 Urinary calculus, unspecified (approximate)