CurrentPremera BluecrossPolicy CP.PP.394.v1.7

Modifier 59 - Distinct Procedural Service

Defines when Premera recognizes Modifier 59 on professional claims to indicate a distinct procedural service and explains related billing rules; applies to Premera Blue Cross lines of business and affiliated products.

Policy Summary

PayerPremera Bluecross

PolicyModifier 59 - Distinct Procedural Service

Policy CodePolicy CP.PP.394.v1.7

Change TypeClarifications and additions (non-material)

Effective Date

Next Review Date

Key ActionDo not append modifier 59 to E&M codes; use modifier 25 or 24 as appropriate and do not submit modifier 59 on the same claim line as XE/XS/XP/XU.

SourceLink

POLICY UPDATE CHANGES

Clarified last paragraph in the Policy statement for multiple procedure reductions related policies.

In the Policy section, added clarification to the sub-bullets and created a new 'Codes/Coding Guidelines' section with full descriptions of the modifiers.

Added paragraph to indicate modifier 59 should not be billed with modifiers XE, XS, XP or XU.

Clarified the Purpose statement to indicate that the policy pertains to Professional services billed on a CMS-1500 or 837P claim forms.

1policy number

05/12/26last review

Applies to all Premera linesscope coverage

2002-2026review history

When Modifier 59 is Recognized

Modifier 59 coverage criteria

The Plan recognizes Modifier 59 for professional services when the procedure/service is distinct from other non‑E&M services on the same day; documentation must support distinctness. Modifier 59 is a modifier of last resort and must not be used with E&M codes.

Documentation must clearly support that the procedure or service was distinct or separate from other services performed on the same day.

Appropriate uses (ONE OR MORE of the following):

Different session
Different procedure or surgery
Different anatomic site(s) or different organs/organ system

Policy Summary

PayerPremera Bluecross

PolicyModifier 59 - Distinct Procedural Service

Policy CodePolicy CP.PP.394.v1.7

Change TypeClarifications and additions (non-material)

Effective Date

Next Review Date

Key ActionDo not append modifier 59 to E&M codes; use modifier 25 or 24 as appropriate and do not submit modifier 59 on the same claim line as XE/XS/XP/XU.

SourceLink

On This Page

Relevant Modifiers and Coding Guidance

Modifiers referencedModifierCovered

59	Modifier 59 - Distinct Procedural Service
24	Modifier 24 - Unrelated E&M service by the Same Physician in the Post-Op Period
25	Modifier 25 - Significant, Separately Identifiable Evaluation and Management Service on Same Day of Procedure or Other service
XE	Modifier XE: Separate Encounter
XS	Modifier XS: Separate Structure
XP	Modifier XP: Separate Practitioner
XU	Modifier XU: Unusual non-overlapping service

Use of more specific X modifiers takes precedence

Priority of X modifiersWhen a more specific X modifier (XE, XS, XP, XU) accurately describes the distinct circumstance, it takes precedence over modifier 59 and should be used instead of 59.

Reason for precedenceXE/XS/XP/XU provide greater specificity about why services are distinct (separate encounter, structure, practitioner, or unusual non‑overlap).

Modifier 59 as last resortModifier 59 remains a modifier of last resort to be used only when no more specific X modifier applies.

Claim-level restrictionModifier 59 must not be submitted on the same claim line as XE, XS, XP or XU.

Documentation requirementDocumentation must clearly support the distinct circumstance to justify using the more specific X modifier in place of modifier 59.

Billing Rules and Required Provider Actions

Billing Rule

Billing rules: Do not use 59 with E&M; use 25 or 24 as appropriate

Do not append modifier 59 to an Evaluation and Management (E&M) code; use modifier 25 to report a separate and distinct E&M on the same date as a non‑E&M service, and use modifier 24 to report an unrelated E&M during the postoperative period. Do not submit modifier 59 on the same claim line as XE, XS, XP or XU. Using modifier 59 does not exempt the service from multiple procedure reductions.

Use modifier 25 for a separate and distinct E&M service performed on the same date as a non‑E&M service.
Use modifier 24 for a separate and distinct E&M service within the postoperative period of another procedure.
Do not append modifier 59 to any E&M code.
Do not submit modifier 59 on the same claim line as modifiers XE, XS, XP or XU.
Modifier 59 does not exempt the service from multiple procedure reductions.

Definitions of Modifiers

Modifier 59 - Definition

DefinitionModifier 59 - Distinct Procedural Service: appended to a procedure code to indicate a procedure or service was separate and distinct or independent from other non‑E&M services performed on the same day/same session.

Appropriate usesDifferent session, different procedure, different anatomic site(s), separate incision/excision, separate non‑contiguous lesions, or separate injury/area of injury.

LimitationsModifier 59 must not be appended to an Evaluation and Management (E&M) code; use modifier 25 or 24 where applicable.

Relationship to X modifiersModifier 59 is a modifier of last resort; XE, XS, XP and XU take precedence due to greater specificity.

Claim submission noteUse of modifier 59 does not exempt the service from multiple procedure reductions and must not be submitted on the same claim line as XE, XS, XP or XU.

Definitions — XE/XS/XP/XU

XE (Separate Encounter)A service that is distinct because it occurred during a separate encounter (e.g., separate surgical sessions or different block of time with no overlap).

XS (Separate Structure)A service that is distinct because it was performed on a separate organ or structure (e.g., different anatomic location).

XP (Separate Practitioner)A service that is distinct because a different practitioner performed it.

XU (Unusual Non‑Overlapping Service)A service that is distinct because it does not overlap with the usual components of the main service (e.g., performed through separate incision/excision or on separate lesions).

Usage noteThese X modifiers describe specific circumstances and take precedence over modifier 59 because of greater specificity; do not submit XE/XS/XP/XU on the same line as modifier 59.