Z49.31
Encounter for adequacy testing for hemodialysis
Z49.31 (also written Z4931) is a billable ICD-10-CM diagnosis code for encounter for adequacy testing for hemodialysis. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 4 codes in category Z49 (Encounter for care involving renal dialysis). The Alphabetic Index lists it under 1 entry. Its coding notes include a Code also instruction and 1 Excludes2 entry.
Guidelines tip
From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.
Aftercare Z codes are not used when treatment is directed at a current, acute disease, or for aftercare of an injury. For an injury, the acute injury code with a 7th character for a subsequent encounter is used.
Code also
Two codes may be needed to describe the condition. This note gives no sequencing order.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (1 note)
- follow-up examination for medical surveillance after treatment (Z08-Z09)
Care settings
How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.
IPF Comorbidity
On the CMS IPF comorbidity list.
| Comorbidity category | Factor |
|---|---|
| Renal Failure, Chronic | 1.08 |
Notes
Also from chapter/block level (3 notes)
- Z codes represent reasons for encounters. A corresponding procedure code must accompany a Z code if a procedure is performed. Categories Z00-Z99 are provided for occasions when circumstances other than a disease, injury or external cause classifiable to categories A00-Y89 are recorded as 'diagnoses' or 'problems'. This can arise in two main ways:
- (a) When a person who may or may not be sick encounters the health services for some specific purpose, such as to receive limited care or service for a current condition, to donate an organ or tissue, to receive prophylactic vaccination (immunization), or to discuss a problem which is in itself not a disease or injury.
- (b) When some circumstance or problem is present which influences the person's health status but is not in itself a current illness or injury.
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 1 entry