ICD-10 · PDGM grouping
N10-N16 — Renal tubulo-interstitial diseases
Every ICD-10-CM code in this range and the PDGM clinical group CMS assigns to it, read from the CMS grouper crosswalk v07.2.26.
Codes in range
35
No clinical group
3
A period cannot be grouped from these.
Barred as primary
0
CMS rejects these in the primary position.
Where these codes group
30 of the 35 codes in N10-N16 group to MMTA - Gastrointestinal tract and Genitourinary system, but the range is not uniform — it spreads across 2 clinical groups. A further 3 are assigned no clinical group at all, which means a 30-day period cannot be grouped from them.
Code families in N10-N16
One page per three-character family: every code in it, whether it can lead a claim, its clinical group and comorbidity subgroup.
- N10Acute pyelonephritis1 code
- N11Chronic tubulo-interstitial nephritis4 codes
- N12Tubulo-interstitial nephritis, not specified as acute or chronic1 code
- N13Obstructive and reflux uropathy18 codes
- N14Drug- and heavy-metal-induced tubulo-interstitial and tubular conditions6 codes
- N15Other renal tubulo-interstitial diseases4 codes
- N16Renal tubulo-interstitial disorders in diseases classified elsewhere1 code
Every code in N10-N16
Descriptions are CMS’s own, abbreviated as CMS abbreviates them.
| Code | Description | Clinical group | Primary position |
|---|---|---|---|
| N10 | Acute pyelonephritis | J | Can lead a claim |
| N110 | Nonobstructive reflux-associated chronic pyelonephritis | J | Can lead a claim |
| N111 | Chronic obstructive pyelonephritis | J | Can lead a claim |
| N118 | Other chronic tubulo-interstitial nephritis | J | Can lead a claim |
| N119 | Chronic tubulo-interstitial nephritis, unspecified | J | Can lead a claim |
| N12 | Tubulo-interstitial nephritis, not spcf as acute or chronic | J | Can lead a claim |
| N130 | Hydronephrosis with ureteropelvic junction obstruction | J | Can lead a claim |
| N131 | Hydronephrosis w ureteral stricture, NEC | J | Can lead a claim |
| N132 | Hydronephrosis with renal and ureteral calculous obstruction | J | Can lead a claim |
| N1330 | Unspecified hydronephrosis | J | Can lead a claim |
| N1339 | Other hydronephrosis | J | Can lead a claim |
| N134 | Hydroureter | J | Can lead a claim |
| N135 | Crossing vessel and stricture of ureter w/o hydronephrosis | J | Can lead a claim |
| N136 | Pyonephrosis | J | Can lead a claim |
| N1370 | Vesicoureteral-reflux, unspecified | J | Can lead a claim |
| N1371 | Vesicoureteral-reflux without reflux nephropathy | J | Can lead a claim |
| N13721 | Vesicoureter-reflux w reflux nephrop w/o hydrourt, unil | J | Can lead a claim |
| N13722 | Vesicoureter-reflux w reflux nephrop w/o hydrourt, bi | J | Can lead a claim |
| N13729 | Vesicoureter-reflux w reflux nephropathy w/o hydrourt, unsp | None | Cannot lead a claim |
| N13731 | Vesicoureter-reflux w reflux nephrop w hydrourt, unil | A | Can lead a claim |
| N13732 | Vesicoureter-reflux w reflux nephrop w hydrourt, bilateral | J | Can lead a claim |
| N13739 | Vesicoureter-reflux w reflux nephropathy w hydroureter, unsp | None | Cannot lead a claim |
| N138 | Other obstructive and reflux uropathy | J | Can lead a claim, code first applies |
| N139 | Obstructive and reflux uropathy, unspecified | J | Can lead a claim |
| N140 | Analgesic nephropathy | J | Can lead a claim, code first applies |
| N1411 | Contrast-induced nephropathy | J | Can lead a claim, code first applies |
| N1419 | Nephropathy induced by other drug/meds/biol subst | J | Can lead a claim, code first applies |
| N142 | Nephrop induced by unsp drug, medicament or biolg sub | J | Can lead a claim, code first applies |
| N143 | Nephropathy induced by heavy metals | A | Can lead a claim, code first applies |
| N144 | Toxic nephropathy, not elsewhere classified | J | Can lead a claim, code first applies |
| N150 | Balkan nephropathy | J | Can lead a claim |
| N151 | Renal and perinephric abscess | J | Can lead a claim |
| N158 | Other specified renal tubulo-interstitial diseases | J | Can lead a claim |
| N159 | Renal tubulo-interstitial disease, unspecified | J | Can lead a claim |
| N16 | Renal tubulo-interstitial disord in diseases classd elswhr | None | Cannot lead a claim |
Source: CMS HH PPS Grouper Software v07.2.26, effective 2026-10-01. This is the crosswalk Medicare runs a claim through. Grouping also depends on admission source, timing, the OASIS functional items and the rest of the diagnosis list.
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