A 270 eligibility inquiry and its 271 response can return information for specific categories of healthcare services. The categories are identified by Service Type Codes (STCs), such as 30 for general plan coverage and 48 for hospital inpatient benefits. For Patient Access, understanding these codes can prevent a broad active-coverage response from being mistaken for approval of a specific hospital or professional service.
What is a Service Type Code?
In HIPAA 005010X279 270/271 transactions, Service Type Codes identify the type of care or benefit being requested or described. They may appear in the inquiry’s EQ segment and in an eligibility response’s EB03 field. A code is the category, not the patient’s eligibility status or their expected bill.
Start with these common eligibility codes
- Code 30 — Health Benefit Plan Coverage
- Code 47 — Hospital
- Code 48 — Hospital Inpatient
- Code 98 — Professional (Physician) Visit — Office
A quick comparison
| Code | 5010 service category | Practical meaning |
|---|---|---|
| 30 | Health Benefit Plan Coverage | General plan coverage; check the specific benefit for the planned service. |
| 47 | Hospital | Broad hospital benefits; inpatient and outpatient details may differ. |
| 48 | Hospital Inpatient | Inpatient benefits; authorization and admission requirements still need separate verification. |
| 98 | Professional (Physician) Visit — Office | Professional office-visit benefits in 5010; do not substitute facility benefits. |
- 30 — Health Benefit Plan Coverage: a general plan coverage category, not proof of service-specific benefits.
- 47 — Hospital: broad hospital category; specific service settings can be reported separately.
- 48 — Hospital Inpatient: specifically inpatient hospital benefits; not an authorization.
- 98 — Professional (Physician) Visit — Office: professional office-visit category in the 5010 eligibility implementation guide.
Why code version matters
X12 warns that its current public Service Type Codes list is not applicable to version 005010. The applicable service-type definitions for HIPAA 5010 eligibility come from the 005010X279 implementation guide, supported by X12’s interpretation of its 5010 requirements and a worked 271 example. A current-list meaning for a numeric code may be different, notably Code 98. Do not mix code-list versions when writing verification procedures.
How to use this reference at registration
- Identify the exact encounter and location: inpatient admission, outpatient hospital, physician office or another setting.
- Confirm the service date and subscriber or dependent information.
- Determine whether the response actually reports active or inactive coverage; do not infer it from the service-type code.
- Review detailed benefit, network, authorization, limitation, and cost-share information returned by the payer.
- If the information is incomplete, document the gap and use an approved escalation or payer verification process.
Important distinction: A Service Type Code (STC) identifies a class of services in an eligibility inquiry or response; it is not a diagnosis code, a procedure code, an authorization, or a payment guarantee. A payer may return active coverage while leaving network status, cost-sharing, medical necessity, and other requirements unresolved.
Frequently asked questions
Does an active Code 30 response guarantee the service is covered?
No. General plan eligibility and the benefits of a specific encounter are separate questions.
Why might Code 47 and Code 48 both appear?
One reports the broad hospital category while the other is specifically inpatient hospital services.
Can I use the public X12 service-type list for every 5010 code?
No. The public list explicitly excludes 005010 applicability; check the applicable implementation guide.
Related Knowledge Base articles
For background on the electronic messages behind eligibility checks, read X12, 270/271, 278 and HL7 Q22/K22 Explained for Patient Access. It explains how eligibility, authorization, and patient-matching exchanges support different parts of the registration workflow.
- Preventing Front-End Claim Denials Without Turning Registration Into an Interrogation
- Why One Registration Error Can Follow a Claim Through the Revenue Cycle
- Prior Authorization Is Changing What Patient Access Teams Need to Know
Sources and further reading
- X12 interpretation RFI 1910 — 005010X279 required and recommended service types
- X12 005010X279 271 eligibility response example
- CareSource 270/271 Eligibility Benefit Inquiry/Response 5010 companion guide
- X12 public Service Type Codes — important note about 005010 version applicability
Sources reviewed October 27, 2026. This reference discusses service type codes used in the HIPAA 005010X279 (270/271) eligibility workflow. Payer responses and local procedures differ. Check the applicable implementation guide, companion guide, and your organization’s approved workflow before making a coverage or financial decision.
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