CurrentBlue Cross Blue Shield - IllinoisPolicy CPCP001
Observation Services Policy
Governs reimbursement and billing rules for observation services provided at facilities to Blue Cross Blue Shield of Illinois members, including documentation, time reporting, and applicable codes; applies to participating providers billing BCBSIL.
Policy Summary
PayerBlue Cross Blue Shield - Illinois
PolicyObservation Services Policy
Policy CodePolicy CPCP001
Change TypeNo material change
Effective DateDec 22, 2025
Next Review DateN/A
Key ActionObservation does not require prior authorization; submit inpatient authorization if the member converts to inpatient and be prepared to provide supporting documentation to determine eligible reimbursement.
SourceLink
POLICY UPDATE CHANGES
No material clinical or coverage changes in this revision.
72maximum observation hours eligible
48hours often considered not appropriate
G0378/G0379facility observation HCPCS
0762required revenue code
99221-99239E/M codes referenced
Observation Services Coverage Criteria
Observation coverage criteria
Covered when all of the following facility-level billing, documentation, time, and exclusion criteria are met:
Observation services are reimbursable only when provided under a physician's order or the order of an authorized practitioner and are member-specific (not part of routine facility protocol).
Observation services are appropriate for short-term evaluation, treatment, or monitoring when the member does not meet inpatient level of care but requires assessment, repeat testing, or reevaluation to determine diagnosis and care needs.
Observation time must be documented with clock times in the medical record (start and end), correspond to the period care was provided per the provider order, and be reported as hours/units on the claim.
Maximum reimbursable duration: services beyond 72 hours are not eligible for reimbursement; services beyond 48 hours are noted as generally not appropriate and some contracts may preclude reimbursement in those circumstances.
Required supporting documentation must be available and include the attending physician's order for observation (with clock time), physician admission and progress notes, admission progress notes with clock time, diagnostic/ancillary test reports, discharge notes with clock time and discharge order, and signatures documenting care during observation.
Facility coding and revenue reporting requirements: hospitals must bill HCPCS G0378 (observation care, per hour) or G0379 (direct admission to observation); G0378 must be billed with revenue code 0762 with units equal to observation hours; only one line of revenue code 0762 is allowed on the UB-04 for observation; G0379 may be billed as one unit and must be billed in conjunction with G0378 when applicable. Hospitals must not report physician CPT observation codes on the UB-04 for hospital observation services.
When observation services and an inpatient admission occur on the same date of service, follow the specific TOB/revenue code guidance: report observation hours with revenue code 0762 and the appropriate Type of Bill depending on inpatient or outpatient status and the temporal relationship to admission/discharge as described in policy.
If the member converts from observation to inpatient, submit inpatient admission/authorization as required; services rendered during observation are included on the inpatient claim and observation dates should not be used as the FROM date on the inpatient UB-04 (use the inpatient admission date).
Observation is not appropriate (and not eligible for observation reimbursement) for certain services including but not limited to: chemotherapy administration; lack of or delay in patient transportation; provision of medical exam without need for skilled services; routine pre- or post-procedure recovery and routine post-operative care following ambulatory surgery; services provided for convenience of the physician or patient; planned overnight stays where observation criteria are not met; general standing orders that should be billed as recovery room; services that would normally require inpatient stay; services following uncomplicated treatment or procedure; services provided concurrently with procedures where active monitoring is part of the procedure (e.g., colonoscopy); services provided when an inpatient is discharged to observation status; services that are not reasonable and necessary for the member's care; observation status does not apply when outpatient administration of blood is the only service and no other medical treatment is provided.
Codes, Time Limits, and Billing
Observation facility HCPCS and revenue codesHCPCS | RevenueCovered
Observation and hospital E/M CPT codesCPTCovered
| 99221-99223 | Initial hospital inpatient or observation care E/M codes |
| 99231-99233 | Subsequent hospital inpatient or observation care E/M codes |
| 99234-99236 | Hospital inpatient/observation care, same-day admission and discharge E/M codes |
| 99238-99239 | Hospital discharge day management codes |
Maximum reimbursable observation duration
Maximum reimbursable observation durationObservation services beyond 72 hours are not eligible for reimbursement.
Shorter appropriateness notePolicy notes that services beyond 48 hours are often considered not appropriate and some contracts may preclude reimbursement.
Effect of inpatient conversionIf the member converts to inpatient, submit an inpatient authorization request; observation hours prior to admission are included on the inpatient claim.
Prior Authorization, Documentation, and Billing Actions
Prior Authorization
Prior authorization not required for observation; inpatient conversion requires authorization and documentation
Observation does not require prior authorization. However, if a member converts from observation to inpatient, the provider should submit an inpatient authorization request. The Plan reserves the right to request supporting documentation to determine eligible reimbursement; observation services beyond 72 hours are not eligible for reimbursement. If the member is discharged from observation and subsequently admitted as an inpatient, all services provided while in observation should be included on the inpatient claim and the UB-04 FROM date should reflect the inpatient admission date (do not use observation dates as the inpatient FROM date).
- Submit an inpatient authorization request if the member converts from observation to inpatient.
- Be prepared to provide requested supporting documentation to substantiate eligible reimbursement.
- Include observation charges on the inpatient claim when a subsequent inpatient admission occurs; use the inpatient admission date as the UB-04 FROM date.
- Observation services beyond 72 hours are not eligible for reimbursement.
Key Definitions
Observation services definition
DefinitionObservation services are short-term evaluation, treatment, or monitoring provided under a physician's order (or authorized practitioner) for members who do not meet inpatient level of care and require assessment to determine diagnosis and care needs.
PurposeProvides a method of evaluation and treatment as an alternative to inpatient hospitalization when repeat testing or reevaluation is necessary.
Order requirementReimbursable only when provided under a physician's order or the order of an authorized practitioner per state licensure and provider bylaws.
Member-specificObservation must be member-specific and not part of routine facility protocol or standard operating procedure.
Observation time
When observation beginsBegins at the time documented in the member's medical record when the member entered observation status that coincides with initiation of observation care per the qualified provider's order.
When observation endsEnds when services associated with observation care are completed and should coincide with the discharge orders.
Claim reporting requirementObservation stay hours must be documented in the 'units' field on the claim form (units equal documented observation hours).
Excluded timeCare provided before the provider's order for observation or after the provider's inpatient admission or discharge order is excluded from total observation time.
Policy Summary
PayerBlue Cross Blue Shield - Illinois
PolicyObservation Services Policy
Policy CodePolicy CPCP001
Change TypeNo material change
Effective DateDec 22, 2025
Next Review DateN/A
Key ActionObservation does not require prior authorization; submit inpatient authorization if the member converts to inpatient and be prepared to provide supporting documentation to determine eligible reimbursement.
SourceLink
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