Modifiers indicate that a service or procedure performed has been altered by some specific circumstance, but not changed in its definition or code. They are used to add information or change the description of service in order to improve accuracy or specificity. Modifiers can be alphabetic, numeric or a combination of both, but will always be two digits. Some modifiers cause automated pricing changes, while others are used for information only. When selecting the appropriate modifier to report on your claim, please ensure that it is valid for the date of service billed.
If more than one modifier is needed please list the Payment modifiers—those that affect reimbursement directly—first. Informational or statistical modifiers (e.g., any modifier not classified as a payment modifier) should be listed after the payment modifier.
Note: If multiple informational/statistical modifiers apply, you may list them in any order (as long as they are listed after payment modifiers).
For modifiers that can be used for more than one topic, please refer to the Additional HCPCS or Other CPT for definition.
Type of Modifier
Additional Healthcare Common Procedure Coding System (HCPCS) Modifiers
AE, AF, AG, AI, AK, AM, AO, AT, AZ, BL, CA, CB, CG, CR, CT, DA, ER, ET, FB, FC, FX, FY, G7, GC, GE, GG, GJ, GU, J1, J2, J3, JC, JC, JD, JG, JW, KX, L1, M2, PD, PI, PO, PN, PS, PT, Q0, Q1, Q3, Q4, Q5, Q6, QQ, RD, RE, SC, SF, SS, SW, TB, TC, TS, UJ, UN, UP, UQ, UR, US, X1, X2, X3, X4, X5, XE, XP, XS, XU, ZA, ZB, ZC
Advance Beneficiary Notice of Noncoverage (ABN) Modifiers
GA, GX, GY, GZ
D, E, G, H, I, J, N, P, R, S, X, GM, QL, QM, QN
(Coronary Artery, Eye Lid, Finger, Side of Body, Toe)
E1, E2, E3, E4, FA,F1,F2,F4, F5, F6, F7, F8, F9, LC, LD, LM, LT, RC, RI, RT, TA, T1, T2, T3, T4, T5, T6, T7, T8, T9
Note: These modifiers should be used in place of modifier 59 whenever possible.
AA, AD, G8, G9, P1, P2, P3, P4, P5,P6, QK, QS, QY, QX, QZ, 23, 33
Assistant at Surgery Modifiers
AS, 80, 81, 82
End Stage Renal Disease (ESRD) and Erythropoiesis Stimulating Agent (ESA) Modifiers
AX, EA, EB, EC, AY, ED, EE, EJ, EM, G1, G2, G3, G4, G5, G6, GS, JA, JB, JE, V5, V6, V7, V8, V9
Global Surgery Modifiers
24, 25, 54, 55, 57, 58, 78, 79
Note: Modifiers 24, 25, 57 apply to Evaluation and Management Services
90, 91, 92, QW
Other Current Procedural Terminology (CPT) Modifiers
26, 27, 33, 59, 76, 77, 95, 96, 97
Q7, Q8, Q9
Quality Reporting Incentive Programs Modifiers
1P, 2P, 3P, 8P, AQ, AR
22, 50, 51, 52, 53, 62, 66, 73, 74, PA, PB, PC
Telehealth Services Modifiers
GQ, GT, G0 (zero)
GN, GO, GP, KX, CH, CI, CJ, CK, CL, CM, CN
There are times when coding and modifier information issued by the Centers for Medicare & Medicaid Services differs from the American Medical Association regarding the use of modifiers. A clear understanding of Medicare's rules and regulations is necessary in order to assign the appropriate modifier.
Examples of when modifiers may be used: