Bladder disorders in diseases classified elsewhere
In Other diseases of the urinary system (N30-N39), chapter 14: Diseases of the Genitourinary System
- N33 is billable and valid on claims for FY 2027. If the record has more detail, check the other codes under N30-N39 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
Excludes1: not coded here, use a different code
Code first: code the underlying condition first, then this code
- underlying disease, such as:
- schistosomiasis (B65.0-B65.9)
Also applies, from Other diseases of the urinary system (N30-N39)
These notes sit on N30-N39 and apply to every code under it, including N33.
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 N30-N39
Other diseases of the urinary system (N30-N39)
- N30Cystitis
- N31Neuromuscular dysfunction of bladder, not elsewhere classified
- N32Other disorders of bladder
- N33Bladder disorders in diseases classified elsewhere(this code)
- N34Urethritis and urethral syndrome
- N35Urethral stricture
- N36Other disorders of urethra
- N37Urethral disorders in diseases classified elsewhere
- N39Other disorders of urinary system
N33 MS-DRGs
As the principal diagnosis, N33 groups to MS-DRG 698, 699, or 700 (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.
N33 is in Other specified and unspecified diseases of bladder and urethra (GEN007), with 62 codes. Others in it:
- A18.12 Tuberculosis of bladder
- N31.0 Uninhibited neuropathic bladder, not elsewhere classified
- N31.1 Reflex neuropathic bladder, not elsewhere classified
- N31.2 Flaccid neuropathic bladder, not elsewhere classified
- N31.8 Other neuromuscular dysfunction of bladder
- N31.9 Neuromuscular dysfunction of bladder, unspecified
- N32.0 Bladder-neck obstruction
- N32.1 Vesicointestinal fistula
Medicare coverage articles listing N33
This Medicare billing and coding article lists N33 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.
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 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).
- 596.89 Other specified disorders of bladder (approximate)