Inpatient & Outpatient Hospital E&M

E/M - Inpatient & Observation (99221-99239)

📋 The Rule (Quick Summary)

One Code Set: As of 2023, there is no difference between “Observation” and “Inpatient” codes. Use the same codes for both. The “8 to 12 Hour” Rule:

• < 8 Hours: Bill Initial Code only (9922x).
• 8-24 Hours (Same Day Discharge): Bill Admission/Discharge Combo (99234-99236).

• 24 Hours: Bill Initial (Day 1) + Subsequent (Day 2) + Discharge (Day 3).

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💰 CPT Selection Logic

1. Initial Care (New Consults / Admissions)

Use this for the First Time you see the patient during their stay. (Requires MDM OR Total Time)

CPT Code	Level	MDM Requirement	Time (Floor/Unit)
99221	Low / SF	Straightforward / Low	40 min
99222	Moderate	Moderate	55 min
99223	High	High	75 min

2. Subsequent Care (Rounding / Daily Visits)

Use this for daily follow-ups.

CPT Code	Level	MDM Requirement	Time (Floor/Unit)
99231	Low / SF	Straightforward / Low	25 min
99232	Moderate	Moderate	35 min
99233	High	High	50 min

3. Discharge Day Management

Only billable on the day the patient leaves.

• 99238: 30 minutes or less.
• 99239: More than 30 minutes. (MUST document time!)

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⚠️ The “Consult” Trap (Medicare vs. Commercial)

• Medicare / Most Payers: Do NOT pay for Consultation codes (99252-99255).
  • Rule: If you are a consultant, you bill 99221-99223 (Initial Hospital Care).
  • Modifier -AI: Only the “Admitting” doctor adds -AI. You (the specialist) generally do not.
• Some Commercial Payers: Still accept 99252-99255. Check your MCW payer grid.

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🎓 Academic Coding (Residents & Students)

Since you are at MCW, this is huge.

1. The “Split/Shared” Rule:

• If an NP/PA and an MD both see the patient, you bill under the NPI of the person who did the “Substantive Portion.”
• Substantive = Did more than 50% of the total time OR performed the complete MDM (Medical Decision Making).

2. Resident Documentation:

• The Teaching Physician (TP) must document that they were present for the key portion of the service.
• Phrase: “I saw and evaluated the patient with Dr. [Resident]. I agree with the findings and plan…”

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🚨 Documentation Alerts (Query Triggers)

1. Discharge Time: For 99239 (the higher paying discharge code), the provider MUST write: “Total time spent on discharge > 30 mins” or “Spent 35 mins on discharge.” If they just write “Discharge note,” you must downcode to 99238.
2. “High” MDM (99223/99233):
   • To hit “High” on Risk, there must be a Decision regarding major surgery (e.g., Deciding to take the kidney stone patient to the OR) OR Escalation of care (e.g., “Patient declining, consider ICU”).
   • Just “Continuing IV antibiotics” is usually Moderate (99232), not High.