Medical Coding Data
Explore official clinical coding guidelines, NCCI bundling implications, documentation checklists, and billing rules for all major CPT and HCPCS modifiers.
| Modifier | Name & Official Descriptor | Category | NCCI PTP Impact | Action |
|---|---|---|---|---|
| 25 |
Modifier 25 indicates that on the day a minor procedure was performed, the patient condition required a significant, separately identifiable E/M service above and beyond the usual pre-procedure and post-procedure care.
|
Evaluation and Management (E/M) | Bypasses NCCI PTP edits with modifier indicator 1. | View Guidelines → |
| 59 |
Modifier 59 identifies procedures or services, other than E/M services, that are not normally reported together but are appropriate under the clinical circumstances.
|
Surgery / Procedural | Primary unbundling modifier used to bypass NCCI PTP edits with modifier indicator 1. | View Guidelines → |
| 26 |
Modifier 26 indicates that only the physician professional component (interpretation and written report) is being billed, rather than technical equipment or technician costs.
|
Radiology / Pathology / Diagnostic | Distinguishes physician professional fees from hospital facility Part A fees. | View Guidelines → |
| TC |
Modifier TC indicates that only the technical component of a diagnostic procedure (equipment, supplies, technician wages) is being billed.
|
Radiology / Pathology / Diagnostic | Separates facility overhead from professional interpretation. | View Guidelines → |
| 22 |
Modifier 22 indicates that the work required to perform a service was substantially greater than typically required.
|
Surgery / Procedural | Triggers manual payer audit and claims review for additional reimbursement consideration. | View Guidelines → |
| 50 |
Modifier 50 identifies bilateral procedures performed during the same operative session.
|
Surgery / Procedural | Payment adjusted to 150% of allowable fee under standard CMS bilateral surgery payment rules. | View Guidelines → |
| 51 |
Modifier 51 indicates that multiple procedures, other than E/M services, were performed during the same session by the same provider.
|
Surgery / Procedural | Applies multiple surgery reduction policy across Medicare and commercial payers. | View Guidelines → |
| 52 |
Modifier 52 indicates that a service or procedure was partially reduced or eliminated at physician discretion.
|
Surgery / Procedural | Payer will typically reduce reimbursement proportionally to omitted service work. | View Guidelines → |
| 53 |
Modifier 53 indicates that a surgical or diagnostic procedure was terminated due to extenuating circumstances or patient safety risk.
|
Surgery / Procedural | Carrier adjudicates claim based on documented surgical phase reached. | View Guidelines → |
| 58 |
Modifier 58 indicates that a procedure during a global postoperative period was planned or staged prospectively, more extensive than original procedure, or for therapy following diagnostic surgery.
|
Global Surgery | Initiates a new global surgical period and bypasses postoperative bundling denials. | View Guidelines → |
| 76 |
Modifier 76 indicates that a procedure or service was repeated subsequent to the original service on the same calendar day.
|
Surgery / Radiology / Diagnostic | Clears duplicate claim screening filters at the Medicare Administrative Contractor (MAC). | View Guidelines → |
| 77 |
Modifier 77 indicates that a procedure was repeated on the same day by a different physician.
|
Surgery / Radiology / Diagnostic | Bypasses MAC automated duplicate billing filters. | View Guidelines → |
| 78 |
Modifier 78 indicates that an unplanned return to the operating room occurred during the global period to treat a surgical complication.
|
Global Surgery | Reimburses the intraoperative work value (approximately 70% of surgical allowable) without paying new pre/post care. | View Guidelines → |
| 79 |
Modifier 79 indicates that a procedure performed during a global surgery period was completely unrelated to the original surgery.
|
Global Surgery | Bypasses postoperative global package denials; pays 100% of standard fee schedule. | View Guidelines → |
| XE |
Modifier XE is a CMS HCPCS modifier identifying a service that is distinct because it occurred during a separate patient encounter on the same date.
|
CMS NCCI X-Modifiers | Bypasses NCCI PTP edits with modifier indicator 1. | View Guidelines → |
| XP |
Modifier XP identifies a service that is distinct because it was performed by a different practitioner within the same group practice.
|
CMS NCCI X-Modifiers | Bypasses NCCI PTP edits with modifier indicator 1. | View Guidelines → |
| XS |
Modifier XS identifies a service that is distinct because it was performed on a separate organ or anatomical structure.
|
CMS NCCI X-Modifiers | Bypasses NCCI PTP edits with modifier indicator 1. | View Guidelines → |
| XU |
Modifier XU identifies a service that is distinct because it does not overlap the usual components of the primary service.
|
CMS NCCI X-Modifiers | Bypasses NCCI PTP edits with modifier indicator 1. | View Guidelines → |
Medical coding modifiers are two-character alpha, numeric, or alphanumeric codes appended to CPT or HCPCS procedure codes. They fall into two primary regulatory categories:
Directly adjust the Medicare allowable reimbursement amount or trigger fee schedule calculations. Examples include Modifier 26 (professional fee), Modifier TC (technical fee), Modifier 50 (150% bilateral adjustment), and Modifier 51 (multiple surgery reduction).
Provide crucial clinical context or establish unbundling eligibility without directly modifying the statutory conversion factor. Examples include Modifier 25 (separate E/M), Modifier 59 (distinct procedural service), and anatomical site indicators (RT, LT, E1-E4).
The Office of Inspector General (OIG) and Comprehensive Error Rate Testing (CERT) contractors routinely target modifier overutilization. The most frequent audit triggers include: