Modifier 52: Reduced Services and How Medicare Pays
Modifier 52 reports a service that was partly reduced or not completed, without anesthesia issues. Medicare's documentation rules, payment, and the 53 line.
Modifier 52 is a billing modifier for a service the practitioner chose to reduce or only partly perform, when no other code describes what was actually done. It tells the payer to pay less than the full fee schedule amount; under Medicare, the contractor sets the reduction from the documentation.
Key takeaways
- 52 means less was done than the code describes, by the practitioner's choice or circumstance, without the anesthesia or safety stop that defines 53.
- Medicare requires a short statement of how the service differed and the supporting record. Without them, the claim isn't priced.
- A code priced for both sides (bilateral indicator 2) done on one side takes 52.
- Medicare doesn't pay partial E/M visits, and 52 can't be used on them.
- Some MACs, such as Noridian, apply a 50% reduction for discontinued procedures that didn't involve anesthesia.
Modifier 52 · payment effect
With and without the modifier
92557 without 52 · national office
$35.74
Comprehensive hearing test
92557-52 · Contractor decides
Varies
Medicare contractors set the payment from documentation; there’s no fixed percentage.
What modifier 52 means
Every code describes a complete service. When the service was meaningfully less than that, and there's no smaller code that fits, modifier 52 reports the reduced version. The reduction can be planned (a test intentionally limited) or happen during the service (a procedure the practitioner ended early for a reason other than the patient's safety after anesthesia).
CMS groups 52 with 22 as the two "unusual circumstances" modifiers: contractors may decrease payment, like they may increase it, "only under very unusual circumstances based upon review of medical records and other documentation" (Pub. 100-04, ch. 12, §20.4.6).
CMS payment indicators · 92557
Comprehensive hearing test
| Rule | CMS value | What it means |
|---|---|---|
| Global period | XXX | The global surgery concept doesn’t apply. |
| Multiple procedures | 0 | No multiple-procedure reduction. |
| Bilateral (modifier 50) | 2 | Already bilateral by definition: paid once at 100%. |
| Assistant at surgery (80/81/82/AS) | 0 | Not paid without supporting documentation. |
| Co-surgeons (62) | 0 | Not permitted. |
| Team surgery (66) | 0 | Not permitted. |
| Professional/technical | 7 | Therapy service: the split doesn’t apply. |
When to use modifier 52
- A bilateral-priced code done on one side. Codes with bilateral indicator 2, such as a comprehensive hearing evaluation (92557), assume both sides. Noridian tells providers to append 52 when only one side was done, rather than RT or LT.
- A procedure or test intentionally reduced below what the code describes, when no other code fits.
- A service discontinued before completion for a reason other than a threat to the patient's well-being after anesthesia or sedation was given.
Put "reduced services" and a brief reason in item 19 of the CMS-1500 (or the electronic equivalent), and keep the full explanation in the record.
When not to use modifier 52
Also skip 52:
- When a smaller code describes the service. Report that code instead of reducing a bigger one.
- When the procedure was stopped for the patient's safety after anesthesia, sedation or the procedure began. That's modifier 53 for the practitioner; hospitals and ASCs use 73 or 74.
- With 22. One says more work, the other less.
How modifier 52 affects payment
There's no national percentage for 52. Medicare prices the claim individually when the statement and supporting documentation are submitted, and doesn't price it without them (Pub. 100-04, ch. 12, §40.4.A). Unlike 22, CMS doesn't restrict 52 to codes with a surgical global period.
Contractors apply their own methods. Noridian states it applies a 50% payment reduction for discontinued procedures that don't involve anesthesia, paying the lower of the charge or the reduced allowance. Commercial payers often set a fixed reduction; check their reimbursement policy.
Modifier 52 vs 53, 22 and 50
| Modifier | Use it when | Medicare payment |
|---|---|---|
| 52 | Service reduced or partly done, no anesthesia-related stop | Reduced by the MAC with documentation |
| 53 | Procedure stopped for the patient's safety | Reduced |
| 22 | Substantially more work than usual | Individual consideration |
| 50 | Same procedure on both sides | 150% for bilateral indicator 1 |
FAQ
What is modifier 52 used for?
To report a service that was reduced or only partly performed, when no other code describes what was done, so the payer pays a reduced amount instead of the full service.
What is the difference between modifier 52 and 53?
52 is for a service reduced or stopped by the practitioner's choice without anesthesia-related risk. 53 is for a procedure the practitioner ended because continuing threatened the patient after it had begun.
Does Medicare pay for modifier 52?
Yes, at a reduced amount set by the contractor from the documentation. Without the statement and records, Medicare doesn't price the line.
Can modifier 52 be used on E/M codes?
Not for Medicare. CMS says 52 can't report partial E/M visits and that Medicare doesn't pay for them.
When should modifier 52 be used for a bilateral procedure?
When the code is priced as bilateral (bilateral indicator 2) and only one side was done. The 52 tells the payer to reduce the payment.
Keep reading
- Modifier 53 for discontinued procedures.
- Modifier 22 for unusually difficult procedures.
- Modifier 50 for bilateral procedures.
- Codes on this page: 92557 45378
Sources: Medicare Claims Processing Manual, Pub. 100-04, ch. 12, §20.4.6, §30.6.18.F (split or shared visits), §40.2.A.10 and §40.4.A; CMS National Physician Fee Schedule Relative Value File, CY 2026 (RVU26D), bilateral indicator; Noridian JE Part B, Modifier 52 (updated May 9, 2025). Verified October 6, 2026.
