Z91.1

Patient's noncompliance with medical treatment and regimen

The ICD-10-CM category Z91.1 refers to instances where a patient fails to adhere to prescribed medical instructions, including pharmacological therapies, lifestyle modifications, or follow-up protocols. Noncompliance, often clinically referred to as non-adherence, is a multidimensional issue that can be intentional (conscious refusal or adjustment of treatment) or unintentional (forgetfulness or external barriers). This clinical indicator is critical for documenting social determinants of health (SDOH), as it identifies specific risks to the patient's recovery and long-term health outcomes. Identifying noncompliance is essential for clinicians to adjust treatment plans, address socioeconomic barriers, and prevent avoidable complications, hospital readmissions, and increased morbidity.

Clinical Symptoms

Uncontrolled physiological markers (e.g., persistently high blood pressure or HbA1c)
Frequent exacerbations of chronic conditions (e.g., asthma attacks, heart failure decompensation)
Missed medical or surgical follow-up appointments
Failure to refill or pick up prescribed medications from the pharmacy
Patient verbalization of non-adherence or decision to discontinue therapy
Laboratory results indicating sub-therapeutic drug concentrations
Worsening clinical signs despite an adequate prescribed treatment plan
Poor wound healing or recurring infections due to failure to follow postoperative care
Inadequate weight management or nutritional status in dietary-dependent conditions

Common Causes

Financial hardship and inability to afford medication or treatment costs
Cognitive impairment including dementia, memory loss, or Alzheimer's disease
Health literacy barriers leading to misunderstanding of dosage or instructions
Psychological factors such as depression, anxiety, or denial of illness severity
Adverse side effects or fear of potential complications from treatment
Complex treatment regimens involving polypharmacy or frequent dosing
Lack of social support or transportation to attend clinical appointments
Cultural beliefs or distrust of medical institutions and healthcare providers
Physical limitations such as inability to open containers or swallow large pills

Documentation & Coding Tips

Distinguish between intentional and unintentional noncompliance to ensure specific subcode assignment.

Example: Patient with persistent Type 2 Diabetes Mellitus with hyperglycemia (E11.65) reports intentional underdosing of insulin glargine due to fear of hypoglycemia while driving for work (Z91.128). This noncompliance contributes to an A1c of 9.4 percent. I spent 35 minutes managing this moderate complexity case, focusing on the patient's refusal of the prescribed regimen.

Billing Focus: Identify the intent of underdosing to satisfy the requirements for Z91.12 or Z91.13 codes.

Explicitly document the barrier to compliance, such as financial hardship or age-related debility.

Example: Established patient with stage 3 chronic kidney disease (N18.31) and essential hypertension (I10) is noncompliant with Lisinopril due to financial hardship (Z91.141) after losing health insurance coverage. Blood pressure today is 162/98. Provided samples and social work referral for medication assistance programs.

Billing Focus: Specificity of the barrier (financial vs. non-financial) supports more granular Social Determinants of Health (SDOH) reporting.

Document the clinical consequences resulting from the noncompliance.

Example: Patient with chronic atrial fibrillation (I48.20) on Warfarin therapy is noncompliant with INR monitoring and medication regimen (Z91.19). Patient has not had a lab check in 4 months and reports missing doses 3 times per week. This increases the immediate risk for thromboembolic stroke (HCC 100).

Billing Focus: Linking the noncompliance to a specific clinical outcome justifies a higher Level of Medical Decision Making (MDM) due to the risk of morbidity.

Incorporate the role of caregivers or family when they contribute to the noncompliance.

Example: 82-year-old patient with Alzheimer dementia (G30.9, HCC 52) exhibits unintentional underdosing of medication regimen due to age-related debility and lack of caregiver oversight (Z91.130). Daughter reports patient forgets to take Aricept daily. Caregiver burden and cognitive decline are the primary drivers of non-adherence.

Billing Focus: Documentation of unintentional status due to debility requires coding from the Z91.13 range.

Specify the exact component of the medical regimen being ignored, such as diet, medication, or follow-up.

Example: Patient with morbid obesity (E66.01, HCC 22) and BMI of 42.5 (Z68.41) is noncompliant with the prescribed low-sodium dietary regimen (Z91.118). Patient admits to daily fast food consumption despite previous counseling. This dietary noncompliance is exacerbating their Stage 2 Hypertension.

Billing Focus: Use Z91.11 for dietary noncompliance to differentiate from Z91.14 (medication) or Z91.19 (treatment).

Relevant CPT Codes

99213 - Office or other outpatient visit for the evaluation and management of an established patient, which requires a Low level of medical decision making and 20-29 minutes of total time spent on the date of the encounter.
Used when discussing adherence for stable patients with minor comorbidities.
99214 - Office or other outpatient visit for the evaluation and management of an established patient, which requires a Moderate level of medical decision making and 30-39 minutes of total time spent on the date of the encounter.
Noncompliance often elevates the risk of the condition, pushing the MDM to moderate.
98960 - Education and training for patient self-management by a qualified, nonphysician health care professional using a standardized curriculum, face-to-face with the patient; 1 patient.
Used to address the root cause of noncompliance through education.
99490 - Chronic care management services, first 20 minutes of clinical staff time directed by a physician or other qualified health care professional, per calendar month.
CCM is specifically designed to improve adherence in patients with multiple chronic issues.
96156 - Health behavior assessment, or re-assessment (i.e., health-focused clinical interview, behavioral observations, clinical decision making).
Used to identify psychological and behavioral barriers to compliance.
99487 - Complex chronic care management services, with the following required elements: multiple chronic conditions expected to last at least 12 months, establishment or substantial revision of a comprehensive care plan, moderate or high complexity medical decision making; 60 minutes of clinical staff time.
Frequent noncompliance requires more intensive care coordination and plan revision.
99215 - Office or other outpatient visit for the evaluation and management of an established patient, which requires a High level of medical decision making and 40-54 minutes of total time spent on the date of the encounter.
High-risk situations where noncompliance causes acute organ failure or immediate hospitalization threat.
90834 - Psychotherapy, 45 minutes with patient and/or family member.
Addressing depression or anxiety that manifests as medical non-adherence.
99401 - Preventive medicine counseling and/or risk factor reduction intervention(s) provided to an individual (separate procedure); approximately 15 minutes.
Focuses on preventing the onset of complications through adherence counseling.
99421 - Online digital evaluation and management service, for an established patient, for up to 7 days, cumulative time during the 7 days; 5-10 minutes.
Used for quick follow-ups on medication titration and adherence checks.