CurrentUnitedHealthcarePolicy 2025R0115B

CMS-1500 Reimbursement for Hospital Inpatient and Observation E/M Services

Governs UnitedHealthcare reimbursement rules for professional services billed on the CMS-1500 related to hospital inpatient and observation evaluation and management (E/M) codes; applies to UnitedHealthcare Commercial and Individual Exchange benefit plans and all network and non-network physicians and other qualified health care professionals.

Policy Summary

PayerUnitedHealthcare

PolicyCMS-1500 Reimbursement for Hospital Inpatient and Observation E/M Services

Policy CodePolicy 2025R0115B

Change TypeNo material changes

Effective Date

Next Review Date

Key ActionPrincipal Physician of Record should append modifier 'AI' to the initial care code to identify oversight responsibility.

SourceLink

POLICY UPDATE CHANGES

No material clinical or coverage changes in this revision.

all productsapplies to

CMS-1500claim form

99221-99239CPT range

8 hrsame-day min

1 per staydischarge limit

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Hospital Inpatient and Observation E/M Coverage Criteria

Hospital inpatient and observation E/M coverage criteria

Reimbursement rules and conditions for reporting hospital inpatient and observation E/M CPT codes on CMS-1500:

Initial Hospital Inpatient or Observation Care (99221-99223) — A physician or other qualified health care professional (QHP) should bill only one initial hospital inpatient or observation E/M code per calendar date, reflecting all services provided that day. The Principal Physician of Record should append modifier 'AI' to the initial care code to identify oversight responsibility. Observation status need not correspond to a specific physical observation unit; services provided in other sites of service on the same date that relate to the admission are incorporated into the initial care code.

Subsequent Hospital Inpatient or Observation Care (99231-99233) — A physician or QHP shall bill only one subsequent hospital inpatient or observation E/M code per calendar date, with the selected code reflecting all services provided that date. UnitedHealthcare will consider reimbursement for additional subsequent E/M codes on the same date for the same patient only when billed by physicians or QHPs from different group practices or by physicians or QHPs from the same group practice who have different primary specialties. Refer to UnitedHealthcare 'Services Incident to a Supervising Health Care Provider and Split or Shared Visits' Reimbursement Policy for split/shared visit reporting guidance.

Hospital Inpatient or Observation Care Admission and Discharge Services on the Same Date (99234-99236) — Payable when the patient is admitted and discharged on the same date after receiving a minimum of 8 hours of inpatient or observation care and the total stay lasted between 8 and 24 hours. These codes require both the admission and discharge services to be performed by the same provider, who must be the Principal Physician of Record; only the Principal Physician of Record may bill 99234-99236.

Hospital Inpatient or Observation Discharge Management Services (99238-99239) — Report these codes to document the total time the physician or QHP spends on discharge activities (final exam, discussion of stay, discharge instructions, preparation of records, prescriptions and referrals). Only one discharge management service (99238 or 99239) is payable per patient for each hospital stay. Other physicians or QHPs who are not the Principal Physician of Record should report subsequent visit codes (99231-99233) for their final visit if they manage other health issues during the stay.

CPT Codes, Time Thresholds, and Billing Limits

Hospital inpatient/observation E/M CPT codesCPTCovered

99221-99223	Initial Hospital Inpatient or Observation Care
99231-99233	Subsequent Hospital Inpatient or Observation Care
99234-99236	Hospital Inpatient or Observation Care Admission and Discharge Services on the Same Date
99238-99239	Hospital Inpatient or Observation Discharge Management Services

Same‑day admission/discharge minimum time

Minimum timePatient must receive a minimum of 8 hours of hospital inpatient or observation care for 99234-99236 to be reported

Total stay windowThe patient's stay must have lasted between 8 to 24 hours

Provider requirementAdmission and discharge services must be performed by the same provider who is the Principal Physician of Record

One‑per‑day rule

One‑per‑day billing ruleA Physician or QHP should bill only one initial (99221-99223) or one subsequent (99231-99233) hospital inpatient/observation E/M code per patient per calendar date

Incorporate same‑day servicesInitial care code level should incorporate other services related to the admission provided on the same date in other sites of service

Billing Actions and Reference Policies for Providers

Billing Rule

Append modifier AI on initial care by Principal Physician

The admitting/supervising physician or other qualified health care professional who is the Principal Physician of Record must append modifier AI to the initial hospital inpatient or observation care code to identify their oversight role when billing the initial encounter.

Documentation Required

Follow UHC split/shared visit policy for reporting

When billing subsequent hospital inpatient or observation care, follow UnitedHealthcare's guidance on split/shared visits — see the 'Services Incident to a Supervising Health Care Provider and Split or Shared Visits' Reimbursement Policy for reporting rules and guidelines.

Key Definitions

Principal Physician of Record

DefinitionThe Principal Physician of Record is the admitting/supervising physician or other qualified health care professional who ordered the hospital inpatient or observation care services and was responsible for the patient during the stay

Billing identifierThis provider should append modifier 'AI' to the initial care code to distinguish oversight responsibility

Exclusive billing for same‑day admission/discharge codesOnly the Principal Physician of Record may bill 99234-99236 when performing both admission and discharge services

Observation Care ('observation status')

DefinitionObservation Care (observation status) are evaluation and management services provided to patients designated as 'observation status' in a hospital; the designation refers to initiation of observation care, not a specific physical area

Location not required

Policy Summary

PayerUnitedHealthcare

PolicyCMS-1500 Reimbursement for Hospital Inpatient and Observation E/M Services

Policy CodePolicy 2025R0115B

Change TypeNo material changes

Effective Date

Next Review Date

Key ActionPrincipal Physician of Record should append modifier 'AI' to the initial care code to identify oversight responsibility.

SourceLink

On This Page

Exceptions for additional reimbursementUnitedHealthcare will consider additional initial or subsequent E/M codes on the same date when billed by physicians/QHPs from different group practices or from the same group practice with different primary specialties

Discharge management per stay

Single discharge service per stayOnly one Hospital Inpatient or Observation Discharge Management service (99238 or 99239) is payable per patient for each hospital stay

What the codes includeCodes 99238/99239 document total time spent on discharge activities including final exam, discussion of the stay, instructions for continuing care and preparation of discharge records

Other physicians' reportingPhysicians or QHPs who are not the Principal Physician of Record should report subsequent visit codes (99231-99233) for their final visit rather than 99238/99239

Patient need not be physically located in a designated observation unit to report observation codes if the medical record documents 'observation status' and the reason for admission

When to use subsequent codesIf a patient remains in observation status beyond a single date, subsequent hospital inpatient/observation care codes (99231-99233) apply for additional calendar dates

Coding guidance and policy applicability

Policy applicabilityThis reimbursement policy applies to professional services billed on CMS‑1500 (and when specified, UB‑04) and uses CPT/CMS guidance for definitional purposes; references do not guarantee reimbursement

Coding referencesHospital inpatient/observation E/M CPT codes addressed include 99221-99239 per policy guidance

Interpretation and discretionUnitedHealthcare may use reasonable discretion in interpreting and applying this policy and other factors (contracts, benefit design, mandates) may modify reimbursement