💉 Modifier -27: Multiple outpatient hospital E/M encounters on the same date
Quick reference
- Definition: Modifier -27 is a facility-side modifier that indicates a hospital outpatient patient received more than one distinct E/M encounter on the same date of service, allowing separate APC payment for each qualifying visit.
- Pairs with: Appended to the second (and any additional) same-day outpatient E/M code on the UB-04 facility claim. No required companion modifier.
- Key rule: -27 is a facility modifier only — it belongs on the UB-04 (hospital outpatient), never on the CMS-1500 (professional/profee claim). Physicians billing their own interpretation or E/M services do not use -27.
When to use -27
Use -27 when:
- A hospital outpatient patient has two or more separate, medically necessary E/M encounters on the same date — e.g., seen in an ophthalmology clinic and then a urology clinic within the same hospital outpatient system on the same day.
- The encounters are clinically distinct — each represents a separate presenting problem, decision-making episode, or treatment encounter (not a continuation of the same visit).
- The facility is billing on a UB-04 and the second (or additional) same-day E/M would otherwise be denied or bundled under OPPS same-day E/M editing rules.
- The patient’s second visit occurs in a different outpatient department or clinic within the same hospital campus or provider-based department on the same date.
When NOT to use -27 (common denials)
- Do not append -27 to claims billed on the CMS-1500; this modifier has no meaning on professional claims and will cause rejection or denial.
- Do not append -27 if the second E/M is a continuation or follow-up of the same encounter — it must be a separate, independently documented visit with its own medical necessity.
- Do not append -27 to non-E/M services (e.g., procedures, diagnostic tests); it applies exclusively to evaluation and management codes.
- Do not append -27 to inpatient E/M services; this modifier is scoped to the hospital outpatient/HOPD setting only.
- Do not append -27 if only one E/M encounter occurred on that date, even if the encounter was complex or lengthy.
CMS hospital outpatient same-date E/M packaging rules
Under OPPS, CMS applies same-day E/M packaging edits that can result in denial of a second E/M when both visits share the same date of service and the same provider/facility. Modifier -27 signals to the payer that the second E/M is a separately identifiable, medically necessary encounter — not a duplicate — and requests independent APC payment.
Key policy points:
- First E/M on the date: Bill without -27; paid at the standard APC rate.
- Second (and additional) E/M on the same date: Append -27 to each additional E/M code to bypass same-day bundling edits and support separate reimbursement.
- APC payment logic: Each -27-appended E/M is evaluated for separate APC assignment; payment is not guaranteed at full rate — some payers apply a reduced or composite rate.
- Payer variation: While CMS OPPS recognizes -27 for Medicare hospital outpatient claims, commercial payers (BCBS of WI, UHC, UMR, Aetna, Cigna) and Wisconsin Medicaid may have independent policies. Always verify payer-specific acceptance before billing.
What you’re paid for with -27 (reimbursement concept)
Without -27, a second same-day outpatient E/M is typically denied or bundled into the first encounter under OPPS packaging rules — resulting in zero additional reimbursement for the facility. Appending -27 to the second E/M signals that a distinct, separately documented service occurred and requests an independent APC payment. The facility receives separate reimbursement for each qualifying encounter rather than a single composite payment, which accurately reflects the resources expended for multiple clinically distinct visits.
Documentation checklist (what has to exist)
To support -27, the record should show:
- Two (or more) separate, complete E/M documentation entries for the same date — each with its own chief complaint, history, assessment, and plan; a single note with an addendum is generally not sufficient.
- A clear distinction in clinical purpose between encounters — different presenting problems, different departments, or different treating providers, documented in a way that makes the medical necessity of each visit independently defensible.
- Separate provider or department identification for each encounter, consistent with your facility’s provider-based department structure and billing rules.
- No indication in the record that the second visit was a recheck, callback, or extension of the first visit on that date.
Common uses (Ophthalmology, ENT, Urology, PM&R context)
Modifier -27 appears in hospital outpatient settings when patients with complex, multi-system conditions are seen by more than one specialty department in a single day — a scenario common across all four of your specialties.
Examples include:
- A patient seen in the ophthalmology HOPD clinic for a retinal follow-up and separately in the urology HOPD clinic for a bladder issue the same day.
- A PM&R outpatient visit following an ENT post-op check at the same hospital outpatient campus on the same date.
- An established patient with multiple comorbidities scheduled for back-to-back specialty clinic visits within the same hospital outpatient system.
In each scenario, the facility appends -27 to the second E/M on the UB-04. The physicians billing their own profee E/M services on CMS-1500 claims do not use -27 — they manage same-date professional billing with modifier -25 (if a procedure is also performed) or simply bill both E/M codes with supporting documentation, per payer policy.
Quick self-check before using -27
- Is this claim on a UB-04 (facility/hospital outpatient)? If no — stop; -27 does not apply to profee CMS-1500 billing.
- Are there two or more separate, fully documented E/M encounters on the same date of service?
- Is each encounter clinically distinct with its own medical necessity — not a continuation or recheck of the same visit?
- Has the payer’s same-date E/M policy been verified? (Medicare OPPS accepts -27; confirm commercial and Wisconsin Medicaid acceptance separately.)
Sources
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Centers for Medicare & Medicaid Services. Medicare Claims Processing Manual, Chapter 4 — Part B Hospital (Including Inpatient Hospital Part B and OPPS). CMS; updated 2025. https://www.cms.gov/regulations-and-guidance/guidance/manuals/downloads/clm104c04.pdf
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Centers for Medicare & Medicaid Services. Hospital Outpatient Prospective Payment System (OPPS) — Addendum B and Modifier Policies. CMS; FY2026. https://www.cms.gov/medicare/medicare-fee-for-service-payment/hospitaloutpatientpps
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American Medical Association. CPT® Professional Edition — Appendix A: Modifiers. AMA; 2026.
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American Academy of Professional Coders (AAPC). Modifier Reference and Coding Guidelines. AAPC; 2025. https://www.aapc.com