All hospital visits, every day of the year
Hospital medicine is a practice model rather than a separate specialty: internists and family physicians, often with nurse practitioners and physician assistants, who care for patients only in the hospital. Their revenue comes from many daily visits across several units and sometimes several hospitals. Charges are captured on the move, shifts hand off patients, and two clinicians often see the same patient on the same day — all of which make missed and mis-assigned charges the main risk.
Hospital and observation visit codes
| Service | Codes | Notes |
|---|---|---|
| Initial hospital inpatient or observation care | 99221–99223 | One code family for both inpatient and observation status since 2023 |
| Subsequent care | 99231–99233 | By medical decision-making or total time on the date |
| Admission and discharge on the same date | 99234–99236 | Used instead of separate admission and discharge codes |
| Discharge management | 99238, 99239 | By time: 30 minutes or less, or more than 30 minutes |
Visits are levelled by medical decision-making or by total time on the date of service. Diagnosis coding matters beyond the claim: the hospitalist’s documentation of conditions, severity and complications is what the hospital’s coders and quality programs rely on.
Split/shared visits and teams
- Split/shared visits: when a physician and an advanced practice provider from the same group both work on a hospital visit, Medicare pays it under the one who performed the substantive portion — more than half of the total time, or the substantive part of the medical decision-making — with modifier FS.
- One visit per day per specialty: payers generally pay one subsequent visit per patient per day for the same group and specialty, so handoffs are combined, not billed twice.
- Prolonged services are reported with an add-on when total time goes beyond the highest level by the required amount, using G0316 for Medicare and 99418 for many other payers.
- Critical care (99291, 99292) is billed by time when the patient is critically ill, under specific same-day rules.
Charge capture across facilities
Hospitalist groups lose revenue when visits are never entered, entered under the wrong clinician or entered late. Reconciling the group’s charges each day against hospital census lists, and against each clinician’s schedule, catches the gaps. Consultation codes are not paid by Medicare, so consults are billed with the appropriate hospital visit codes — see medical coding services.