ICD-10-CM 2027
ICD-10 code for noncompliance
Patient's noncompliance with other medical treatment and regimen due to unspecified reason
From the official ICD-10-CM alphabetic index entry “Noncompliance”. Page updated September 29, 2026.
About coding noncompliance
The ICD-10-CM code for noncompliance is Z91.199 (Patient's noncompliance with other medical treatment and regimen due to unspecified reason). The official index lists 28 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on Z91.199.
Within Z91.19, choose Z91.199 (due to unspecified reason) only when documentation doesn't support a more specific option: due to financial hardship (Z91.190) and for other reason (Z91.198).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 951 (Other Factors Influencing Health Status, relative weight 0.5577), in MDC 23 (Factors Influencing Health Status and Other Contacts with Health Services), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific noncompliance codes (official index)
- with
- dietary regimen Z91.119 — Patient's noncompliance with dietary regimen due to unspecified reason
- due to
- financial hardship Z91.110 — Patient's noncompliance with dietary regimen due to financial hardship
- specified reason NEC Z91.118 — Patient's noncompliance with dietary regimen for other reason
- dialysis Z91.158 — Patient's noncompliance with renal dialysis for other reason
- due to financial hardship Z91.151 — Patient's noncompliance with renal dialysis due to financial hardship
- medical treatment, specified NEC Z91.199 — Patient's noncompliance with other medical treatment and regimen due to unspecified reason
- due to
- financial hardship Z91.190 — Patient's noncompliance with other medical treatment and regimen due to financial hardship
- specified reason NEC Z91.198 — Patient's noncompliance with other medical treatment and regimen for other reason
- medication regimen NEC Z91.148 — Patient's other noncompliance with medication regimen for other reason
- due to financial hardship Z91.141 — Patient's other noncompliance with medication regimen due to financial hardship
- underdosing Z91.148 — Patient's other noncompliance with medication regimen for other reason
- intentional NEC Z91.128 — Patient's intentional underdosing of medication regimen for other reason
- by caregiver
- due to
- financial hardship Z91.A20 — Caregiver's intentional underdosing of patient's medication regimen due to financial hardship
- specified reason NEC Z91.A28 — Caregiver's intentional underdosing of medication regimen for other reason
- due to financial hardship of patient Z91.120 — Patient's intentional underdosing of medication regimen due to financial hardship
- unintentional NEC Z91.138 — Patient's unintentional underdosing of medication regimen for other reason
- by caregiver Z91.A3 — Caregiver's unintentional underdosing of patient's medication regimen
- due to patient's age related debility Z91.130 — Patient's unintentional underdosing of medication regimen due to age-related debility
- renal dialysis Z91.158 — Patient's noncompliance with renal dialysis for other reason
- due to financial hardship Z91.151 — Patient's noncompliance with renal dialysis due to financial hardship
- caregiver
- with patient's
- dietary regimen
- due to
- financial hardship Z91.A10 — Caregiver's noncompliance with patient's dietary regimen due to financial hardship
- specified reason NEC Z91.A18 — Caregiver's noncompliance with patient's dietary regimen for other reason
- medical treatment and regimen
- due to financial hardship Z91.A91 — Caregiver's noncompliance with patient's other medical treatment and regimen due to financial hardship
- specified reason NEC Z91.A98 — Caregiver's noncompliance with patient's other medical treatment and regimen for other reason
- medication regimen
- due to financial hardship Z91.A41 — Caregiver's other noncompliance with patient's medication regimen due to financial hardship
- specified reason NEC Z91.A48 — Caregiver's other noncompliance with patient's medication regimen for other reason
- renal dialysis
- due to financial hardship Z91.A51 — Caregiver's noncompliance with patient's renal dialysis due to financial hardship
- specified reason NEC Z91.A58 — Caregiver's noncompliance with patient's renal dialysis for other reason
Common questions about noncompliance ICD-10 codes
What is the ICD-10 code for noncompliance?
- Z91.199 — Patient's noncompliance with other medical treatment and regimen due to unspecified reason. More specific codes apply when the documentation supports them: Z91.119, Z91.110, Z91.118, Z91.158 and others below.
Is Z91.199 billable?
- Yes. Z91.199 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Z91.199 be used as a principal diagnosis?
- No. It is not acceptable as the principal diagnosis for an inpatient stay; it may be reported as a secondary diagnosis.
Is Z91.199 a CC or MCC?
- No. Z91.199 is neither a CC nor an MCC under MS-DRG v44.0.