CPT Codes for Inpatient Admission

Inpatient admission occurs when a physician or qualified healthcare provider formally assumes responsibility for a patient’s care in a hospital setting. This includes evaluating the patient, ordering tests, developing a treatment plan, and managing ongoing care. Accurate coding ensures proper billing, compliance, and documentation.

1. Initial Hospital Inpatient Care

Used on the day of admission when the provider evaluates the patient:

99221 — Initial hospital care, low complexity

99222 — Initial hospital care, moderate complexity

99223 — Initial hospital care, high complexity

Documentation requirements:

Chief complaint and reason for admission

History of present illness and relevant medical history

Physical examination findings

Medical decision-making (tests, consultations, treatment plan)

2. Subsequent Daily Care

For follow-up visits after admission:

99231 — Subsequent hospital care, low complexity

99232 — Subsequent hospital care, moderate complexity

99233 — Subsequent hospital care, high complexity

Documentation:

Daily evaluation of progress

Review of test results

Adjustments to treatment plan

3. Hospital Discharge Services

Covers evaluation and planning on the day of discharge:

99238 — Discharge day management, ≤30 minutes

99239 — Discharge day management, >30 minutes

Documentation:

Summary of hospital course

Final diagnoses and procedures

Medications, follow-up instructions, patient education

4. Same-Day Admission and Discharge

99234–99236 — Used when the patient is admitted and discharged on the same calendar day

Criteria:

Minimum stay duration (usually ≥8 hours)

Same provider performs both admission and discharge

Documentation supports admission, care, and discharge

Key Points for Coding Inpatient Admission

Use the correct initial vs. subsequent code

Initial admission: 99221–99223

Subsequent daily care: 99231–99233

Document thoroughly

Include history, exam, medical decision-making, interventions, and patient status

Time-based vs. MDM-based coding

2025 guidelines allow using either total time spent or complexity of medical decision-making to select code

Discharge documentation is essential

Use 99238 or 99239 based on time spent

Summary Table:

Service CPT Code Complexity / Notes
Initial hospital care 99221 Low complexity
Initial hospital care 99222 Moderate complexity
Initial hospital care 99223 High complexity
Subsequent hospital care 99231 Low complexity
Subsequent hospital care 99232 Moderate complexity
Subsequent hospital care 99233 High complexity
Discharge day management 99238 ≤30 minutes
Discharge day management 99239 >30 minutes
Same-day admission & discharge 99234 Moderate, admitted & discharged same day
Same-day admission & discharge 99235 High, admitted & discharged same day
Same-day admission & discharge 99236 Complex, admitted & discharged same day