Historical & Discontinued Modifiers

Browse historical and discontinued medical billing modifiers, including their former uses, replacement guidance, and current billing status.

60

Altered Surgical Field

Historical modifier replaced by current billing guidance.

KZ

New Coverage Not Implemented

Historical Medicare managed care transition modifier

Historical & Discontinued Modifiers

Historical Medical Billing Modifier Reference

Explore medical billing modifiers that have been discontinued, replaced, or are no longer recognized for their former billing purposes.

Historical modifiers can still appear in older claims, billing manuals, medical records, and coding resources. This directory provides reference information about what these modifiers previously meant, how they were used, and the current guidance that replaced them when applicable.

Historical & Discontinued Modifier Directory

Use the directory below to find modifiers that are no longer considered active for their former billing purposes.

Each modifier page explains its historical use, previous billing requirements, and replacement guidance when available.

[KEEP YOUR EXISTING MODIFIER CARDS HERE]

Understanding Historical Modifiers

Medical billing modifiers change as Medicare and other payers update coding policies, payment systems, coverage requirements, and claim-processing rules.

A modifier found on an older claim or in an outdated coding resource may no longer be appropriate for current billing.

Some modifiers are completely discontinued, while others become obsolete because the underlying billing policy changes or a different modifier, code, or reporting method replaces them.

ModifierLookup.com maintains these pages so billers, coders, and healthcare professionals can research older modifier information without confusing it with the site's active modifier directory.

Why Medical Billing Modifiers Are Discontinued

Policy Changes: Medicare or another payer may eliminate or substantially revise the policy that originally required a modifier.

Replacement Modifiers: A newer modifier may provide a more accurate or standardized method of reporting the same billing circumstance.

Updated Claim Reporting: Information previously communicated through a modifier may move to another code, condition code, claim field, or reporting process.

Program Changes: Temporary demonstrations, payment programs, or coverage policies may end, eliminating the need for modifiers created specifically for those programs.

Coding Updates: HCPCS and other coding systems are updated regularly to reflect changes in healthcare services and reimbursement requirements.

Before Using an Older Modifier

Verify Current Status: Confirm that the modifier remains valid for the applicable date of service before placing it on a claim.

Check Current CMS Guidance: Medicare billing instructions, HCPCS updates, NCCI guidance, and other CMS resources should be checked when Medicare claims are involved.

Review Payer Requirements: Commercial insurers, Medicaid programs, and other payers may have requirements that differ from Medicare.

Look for a Replacement: Determine whether the historical modifier has been replaced by another modifier, code, or claim-reporting method.

Consider the Date of Service: Historical modifier rules may still be relevant when researching or correcting claims from periods when the modifier was active.

Historical Information vs. Current Billing

The modifiers listed in this section are maintained primarily for historical research and coding reference.

A modifier appearing in this directory should not be interpreted as confirmation that it is valid for current claims.

Individual historical modifier pages explain the modifier's former purpose and, when applicable, identify newer billing guidance or replacement reporting methods.

For current claims, always verify the applicable modifier and billing requirements for the specific payer and date of service.

Frequently Asked Questions

Can a discontinued modifier still appear on an older medical claim?
Yes. Historical claims may contain modifiers that were valid for the applicable date of service even though those modifiers are no longer appropriate for current claims.

Should I use a historical modifier if I find it in an older coding guide?
Not without verifying its current status. Coding and payer policies change over time, so current HCPCS, Medicare, and payer guidance should be reviewed before submitting the modifier on a new claim.