Home Health Coding Fundamentals
What is Home Health Coding?
Home health coding assigns ICD-10-CM codes to patient diagnoses for Medicare home health visits. Accurate coding drives reimbursement under PDGM (Patient-Driven Groupings Model) and determines quality measure outcomes reported to CMS.
Medicare Home Health Benefit
ELIGIBILITY REQUIREMENTS (all must be met):
1. Physician certifies patient is homebound
Homebound = leaving home requires considerable/taxing effort
Allowed: brief, infrequent absences for medical appointments, religious services
2. Need for skilled care:
Skilled nursing (wound care, injections, patient education, complex medication management)
Physical therapy, occupational therapy, or speech-language pathology
NOT: custodial care only (bathing, dressing assistance without skilled need)
3. Services provided by Medicare-certified home health agency
4. Physician orders home health (face-to-face encounter requirement)
F2F encounter within 90 days before or 30 days after start of care
Certifying physician must document clinical findings supporting homebound status and skilled need
COVERED SERVICES:
Skilled nursing visits (most common)
Physical therapy | Occupational therapy | Speech-language pathology
Medical social work | Home health aide (only if also receiving skilled service)
NOT COVERED:
24-hour-a-day care | Meals delivered to home
Homemaker services | Personal care when no skilled need
Custodial care (bathing, dressing) without skilled nursing or therapy need
Key Documents in Home Health
OASIS (Outcome and Assessment Information Set):
Required for all Medicare home health patients
Comprehensive clinical assessment (100+ data items)
Completed by: registered nurse or therapist
Submitted to CMS via state agency software
OASIS TIMEPOINTS:
SOC (Start of Care): within 5 days of admission
ROC (Resumption of Care): after inpatient stay
FU (Follow-up): 60 days after SOC/ROC (if still on service)
Transfer to inpatient
DC (Discharge): at end of care
PLAN OF CARE (485 Form):
Physician-ordered care plan for 60-day certification period
Includes: diagnoses, medications, treatments, goals, frequency of visits
Must be signed by physician before billing
CLINICAL RECORD:
Visit notes for each clinical visit
Support skilled need and homebound status
Must corroborate OASIS findings and coded diagnoses
Study Resources
•CMS Home Health Center (cms.gov/center/provider-type/home-health-center) — official
•NAHC (nahc.org) — home care industry association with educational resources
•OASIS Guidance Manual (cms.gov) — free, definitive OASIS reference
•AAPC Codify — online coding tool with home health-specific guidance