N25.89 — Other disorders resulting from impaired renal tubular function
N25.89 is a billable, specific ICD-10-CM code for other disorders resulting from impaired renal tubular function. It is valid for submission on a claim.
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Hypokalemic nephropathy
- Lightwood-Albright syndrome
- Renal tubular acidosis NOS
Risk adjustment
N25.89 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
N25.89 is named in 3 Medicare coverage policies — 3 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A57122Billing and Coding: Parathormone (Parathyroid Hormone)
- A57189Billing and Coding: Serum Magnesium
- A59186Billing and Coding: Magnesium
How N25.89 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to N25.89.
- Lightwood-Albright syndrome
- Lightwood's disease or syndrome(renal tubular acidosis)
- Water-losing nephritis
- Acidosis›kidney, tubular
- Acidosis›renal(hyperchloremic) (tubular)
- Disease, diseased›Lightwood's(renal tubular acidosis)
- Nephropathy›hypercalcemic
- Nephropathy›hypokalemic(vacuolar)
- Nephropathy›potassium depletion
- Nephropathy›protein-losing
- Nephropathy›water-losing
- Nephrosis, nephrotic›osmotic(sucrose)
Related codes at this level
Codes that share N25.8. If N25.89 is not quite right, the correct code is usually one of these.
Questions about N25.89
- Is N25.89 a billable ICD-10-CM code?
- Yes. N25.89 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does N25.89 sit in the tabular list?
- Diseases of the genitourinary system (N00-N99), in the block Other disorders of kidney and ureter (N25-N29).