ICD-10-CM Coding for NSAID-Induced Renal Injury
The appropriate ICD-10-CM diagnosis code for NSAID-induced kidney damage is N14.0 (Analgesic nephropathy), which should be paired with an adverse effect code from the T39 series (T39.3x5A for NSAIDs) to indicate the causative agent.
Coding Structure
When documenting NSAID-induced renal injury, you need a two-code approach:
Primary Diagnosis Code
- N14.0 - Analgesic nephropathy (covers drug-induced tubular and interstitial nephropathy)
Secondary Code (Mandatory)
- T39.3x5A - Adverse effect of propionic acid derivatives (ibuprofen, naproxen), initial encounter
- T39.095A - Adverse effect of other NSAIDs, initial encounter (for ketorolac, diclofenac, etc.)
- Use the appropriate 7th character: A (initial), D (subsequent), or S (sequela)
Clinical Context
NSAIDs cause multiple patterns of renal injury 1:
- Volume-dependent acute renal failure (most common - from prostaglandin inhibition)
- Acute interstitial nephritis (immune-mediated, can occur after even a single dose 2)
- Nephrotic syndrome
- Renal tubular acidosis (rare but documented 3)
All NSAIDs—both selective COX-2 inhibitors and nonselective agents—carry renal toxicity risk because COX-2 is essential for renal prostaglandin production 1.
Additional Coding Considerations
If specific manifestations are present, add:
- N17.x - Acute kidney injury (specify stage if applicable)
- N18.x - Chronic kidney disease (if pre-existing or develops)
- N10 - Acute tubular necrosis (if biopsy-confirmed)
- N12 - Tubulo-interstitial nephritis, not specified as acute or chronic
Important Caveats
ICD-10 coding significantly underestimates renal injury prevalence. Research shows ICD-10 codes identify only 59.5% of acute kidney injury cases and 54.1% of chronic kidney disease cases when compared to KDIGO criteria 4. This means nearly half of NSAID-induced renal damage may go unrecorded in administrative data.
Risk is highest in patients with:
- Pre-existing renal disease
- Congestive heart failure
- Cirrhosis
- Concurrent use of ACE inhibitors, ARBs, or beta blockers 1
Approximately 2% of NSAID users develop renal complications severe enough to discontinue therapy 1.