Billing Modifiers Guide 2026: Modifier 25, 59, GT, 95 & When to Use Each
Billing modifiers are two-character codes appended to CPT codes to tell the payer that a service was performed under circumstances different from what the base code implies. Used correctly, they prevent bundling, clarify distinct services, and protect claims from automatic edits. Used incorrectly, they become a compliance liability. This guide covers the modifiers your billing team will use most frequently — what they mean, when they apply, and where the audit risk lies.
The Quick-Reference Modifier Summary
| Modifier | Name | Primary Use |
|---|---|---|
| 25 | Significant, Separately Identifiable E&M | Bill E&M same day as procedure |
| 59 | Distinct Procedural Service | Unbundle services that are typically bundled |
| XE / XS / XP / XU | Selective Modifiers (X-modifiers) | More specific alternatives to Modifier 59 |
| 51 | Multiple Procedures | Second surgical procedure same day, same provider |
| GT | Via Interactive Audio and Video | Telehealth — commercial payers (pre-2026 legacy) |
| 95 | Synchronous Telemedicine | Telehealth — real-time audio-video visit |
| 93 | Synchronous Telemedicine — Telephone | Audio-only telehealth visit |
| 26 | Professional Component | Physician interpretation only (no facility fee) |
| TC | Technical Component | Facility/equipment cost only (no physician read) |
| 22 | Increased Procedural Services | Procedure substantially more complex than usual |
| 50 | Bilateral Procedure | Same procedure performed on both sides |
| 52 | Reduced Services | Procedure not fully completed as described |
| 57 | Decision for Surgery | E&M on day of or day before surgery, decision made then |
| 24 | Unrelated E&M During Postoperative Period | E&M during global period for unrelated condition |
Modifier 25 — The Most Commonly Used and Misused Modifier
Modifier 25 tells the payer that on the same date a procedure was performed, the physician also provided an E&M service that was significant and separately identifiable — meaning it went beyond the pre-service evaluation that's inherent in any procedure.
The documentation test: could the E&M note stand alone as a complete visit, separate from any mention of the procedure? If yes, Modifier 25 likely applies. If the note only discusses the procedure, it doesn't.
Modifier 59 — The Unbundling Override
Modifier 59 indicates that a procedure was distinct from another service billed on the same date — different session, different site, separate organ, or a service not typically performed on the same day that was clinically required. It overrides the CCI (Correct Coding Initiative) edit that would otherwise bundle the second code into the first.
The X-Modifiers: CMS's Preferred Alternative to Modifier 59
In 2015 CMS introduced four sub-set modifiers that are more specific than Modifier 59. CMS instructs MACs to recognize these as equivalent to Modifier 59, but they communicate the reason for distinctness more precisely:
| Modifier | Meaning | When to Use |
|---|---|---|
| XE | Separate Encounter | Services were performed during a separate patient encounter on the same date |
| XS | Separate Structure | Services were performed on a separate organ/structure |
| XP | Separate Practitioner | Services were performed by a different practitioner |
| XU | Unusual Non-Overlapping Service | Service is not typically done at the same time as the other billed service |
Use XS when two procedures were done on anatomically distinct sites. Use XE when the same provider saw the patient twice in one day for separate visits. Use XP when a different clinician in the group performed the second service.
Telehealth Modifiers: GT, 95, and 93
Modifier 95 is the current standard for live, real-time audio-video telehealth visits under Medicare and the majority of commercial plans. It replaced Modifier GT as the primary telehealth modifier for most payers beginning in 2022 and is now universally preferred.
Modifier 95 must be paired with the correct place of service code: POS 02 (telehealth, not patient home) or POS 10 (telehealth, patient home). The modifier alone is not sufficient — the POS must also match.
Modifier GT was the standard telehealth modifier before Modifier 95 was adopted broadly. Medicare no longer requires GT — it accepts Modifier 95. However, some commercial payers and Medicaid programs still require GT. Always check the payer's current telehealth billing guidelines before switching.
Modifier 93 covers audio-only (telephone) visits where video was not used. Under Medicare, audio-only telehealth is limited to specific circumstances — primarily behavioral health services and situations where the patient is unable to access video technology.
Modifier 26 and TC — Splitting Global Services
Many diagnostic services (radiology, EKG, EEG, pulmonary function tests) have two components: the technical component (the equipment and technician performing the test) and the professional component (the physician's interpretation and report). When billed without a modifier, the code represents the global service — both components. Modifier 26 isolates just the professional component.
Modifier 51 — Multiple Procedures
When a surgeon performs two or more procedures in the same operative session, the primary (highest-value) procedure is billed without Modifier 51. Each additional procedure is billed with Modifier 51 to indicate it is a secondary procedure. Most payers apply a reduction (typically 50%) to procedures billed with Modifier 51.
Modifier 22 — Increased Procedural Complexity
Modifier 22 indicates that the work required to perform a procedure was substantially greater than usual — due to unusual patient complexity, anatomical difficulty, complications encountered, or unusual circumstance. Most payers won't automatically increase payment for Modifier 22; it typically requires manual review and a supporting operative note.
Always attach an operative note or supporting letter when billing Modifier 22 that explicitly describes what made the procedure more complex and the additional time required. Without this, payers will simply strip the modifier and pay the standard rate.
Modifier 57 vs. Modifier 25 — A Common Confusion
Both Modifier 25 and Modifier 57 apply to E&M services billed on the same day as a procedure — but they're not interchangeable:
| Modifier 25 | Modifier 57 | |
|---|---|---|
| When to use | E&M on same day as a minor procedure (global period 0 or 10 days) | E&M on the day of or day before a major surgery (global period 90 days), when the E&M was the visit at which the decision for surgery was made |
| Applied to | The E&M code | The E&M code |
| Example | Office visit + same-day injection | Consult on Monday, surgery on Tuesday — Monday E&M gets -57 |
| Global period | 0–10 day global procedures | 90-day global surgeries |
Modifier 24 — E&M During the Postoperative Period
When a patient comes in during a surgery's global period for a condition completely unrelated to the surgery, the E&M is separately billable with Modifier 24. The documentation must clearly establish that the visit addressed a different diagnosis than the surgical condition. Without Modifier 24, the E&M will be denied as included in the global surgical package.
Modifier Stacking: When Multiple Modifiers Are Needed
CPT allows up to four modifiers per code. When multiple modifiers are used, they must appear in the correct order. The general rule:
- Pricing modifier first — modifiers that affect payment (26, TC, 50, 52, 22)
- Informational modifier second — modifiers that provide context without changing price (25, 59, 91, 76, 77)
Example: A bilateral procedure with a reduced service: 27310-50-52 (pricing modifiers in front). An E&M with telehealth distinction: 99213-25-95 is acceptable; most payers process the first modifier for payment logic.
Related Resources
Building Modifier Compliance Into Your Workflow
Modifier errors fall into two categories: over-use (appending modifiers to bypass edits without clinical justification) and under-use (missing modifiers that would allow a legitimate service to pay). Both cost money — over-use creates audit exposure, under-use leaves revenue on the table.
At Rcmaxis, we configure payer-specific modifier rules into the claim scrubber before submission — so claims with Modifier 25 trigger a documentation check, claims with Modifier 59 require a CCI edit flag to be present, and telehealth claims automatically verify the POS matches the modifier used.
If your practice is seeing consistent modifier-related denials or you're unsure whether your modifier usage patterns would survive an audit, request a free revenue assessment. We'll review your last 60 days of claims and flag any modifier patterns that carry risk.
References
- AMA. (2026). CPT Professional Edition 2026. American Medical Association.
- CMS. (2026). National Correct Coding Initiative (NCCI) Policy Manual. Centers for Medicare & Medicaid Services.
- HHS OIG. (2025). OIG Work Plan: Modifier 59 Billing Patterns. Office of Inspector General.
- CMS. (2022). Modifier 95 and Telehealth Billing Guidelines. MLN Matters MM12427.
- CMS. (2026). Claims Processing Manual, Chapter 12 — Physician/Nonphysician Practitioners. CMS Pub. 100-04.
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