Z49.31 Encounter for adequacy testing for hemodialysis

Billable ICD-10-CM code, FY2026. Exempt from present-on-admission (POA) reporting.

Applies from Z49 Encounter for care involving renal dialysis

Code also

• associated end stage renal disease (N18.6)

Risk adjustment (HCC)

• CMS-HCC V22: HCC 134 — Dialysis Status
• RxHCC V08: HCC 261 — Dialysis Status, Including End Stage Renal Disease
• ESRD V24: HCC 134

MS-DRG index

Defines the logic of DRG(s) 698-700 in MDC 11.

Approximate ICD-9-CM (GEMs)

• V56.31 Encounter for adequacy testing for hemodialysis (approximate)

Medicare Code Edits (MCE v43.1 (April 2026))

• Unacceptable principal diagnosis: These codes describe a circumstance which influences care but is not a current illness or injury, or capture only an underlying condition, and are unacceptable as principal diagnosis.

Code annotations containing back-references to Z49.31

Back-references to Z49

• Type 1 Excludes: Z08 Encounter for follow-up examination after completed treatment for malignant neoplasm ("aftercare following medical care (Z43-Z49, Z51)")
• Type 1 Excludes: Z09 Encounter for follow-up examination after completed treatment for conditions other than malignant neoplasm ("aftercare following medical care (Z43-Z49, Z51)")
• Type 2 Excludes: Z98 Other postprocedural states ("aftercare (Z43-Z49, Z51)")

Diagnosis Index entries for Z49.31

• Test, tests, testing (for) › adequacy (for dialysis) › hemodialysis

Nearby codes

• Z49 Encounter for care involving renal dialysis
• Z49.0 Preparatory care for renal dialysis
• Z49.01 Encounter for fitting and adjustment of extracorporeal dialysis catheter
• Z49.02 Encounter for fitting and adjustment of peritoneal dialysis catheter
• Z49.3 Encounter for adequacy testing for dialysis
• Z49.31 Encounter for adequacy testing for hemodialysis (this code)
• Z49.32 Encounter for adequacy testing for peritoneal dialysis