Medical Necessity in Rehab

Tags: compliance medical-necessity medicare

Definition

Medical necessity is the cornerstone of all PM&R billing. Services must be reasonable and necessary for the diagnosis and treatment of the patient’s condition.

Medicare Criteria (LCD Requirements)

For a service to be considered medically necessary, it must:

1. Require Skilled Services: Cannot be performed by unskilled personnel
2. Be Specific & Effective: For the patient’s condition
3. Have Expected Improvement: Reasonable expectation of functional improvement
4. Be Appropriate: In frequency, duration, and intensity
5. Be Documented: Clear documentation supporting all above

Functional Improvement Standard

Maintenance vs. Skilled Care

Medicare does NOT pay for maintenance therapy alone. There must be expectation of functional improvement OR skilled services needed to establish/maintain a maintenance program.

Documentation Elements

Element	Requirement
Diagnosis	Specific ICD-10 with laterality
Functional Limitation	Impact on ADLs, mobility, self-care
Goals	Measurable, time-bound, functional
Progress	Objective measures at each visit
Plan	Frequency, duration, specific interventions

Red Flags for Medical Necessity

• No functional limitations documented
• Goals not measurable (“improve strength”)
• No progress over 30+ days without plan change
• Treatment continues after maximum improvement reached
• Same treatment plan for months without modification

Supporting Medical Necessity

Subjective: Patient reports difficulty climbing stairs (2 flights) Objective: LE strength 4/5, requires handrail for stairs Assessment: Functional limitation - stair negotiation Plan: Therapeutic exercise to improve LE strength for ADL function

Functional Reporting

For outpatient therapy, Medicare requires G-codes and severity modifiers to track functional limitations at reporting intervals (every 10 visits).

PM&R Coding MOC Documentation Requirements CMS Medicare Guidelines