CPT 92937: Complete Billing Guide, Description, Modifiers, Documentation, and Medicare Reimbursement (2026)
A biller keys a vein graft intervention the way she has for years: 92937 for the first branch, then 92938 for the second. In 2026, that second line comes back rejected, because 92938 no longer exists. The claim isn't wrong clinically. It's wrong by one code revision.
That's the trap with CPT 92937. Many guides still describe it with its old add-on partner, and the payment picture has shifted too. This guide covers what the code means today, how to document and modify it, what Medicare pays, and where claims go sideways.
What Is CPT Code 92937?
CPT 92937 reports percutaneous revascularization of, or through, a coronary artery bypass graft (internal mammary, free arterial, or venous), using any combination of stenting, atherectomy, and angioplasty, for a single major coronary artery and/or its branches. Distal embolic protection is part of the code when used.
In plain terms: the interventionalist is working in or through a previously placed bypass graft rather than a native coronary vessel. This differentiation influences every aspect of the claim's construction.
CPT 92937 Overview
| Element | Detail |
|---|---|
| Code type | CPT Category I, Medicine section (PCI family) |
| Setting | Hospital cath lab (facility-based) |
| Global period | 0 days |
| Reported per | Each bypass graft treated (with its subtended artery and branches) |
| Add-on partner | No extra branches for 2026; 92938 was removed as of January 1, 2026. |
| Sibling codes | 92928 (native stent), 92941 (acute MI), 92943 and 92945 (chronic total occlusion) |
CPT 92937 Description: What Changed in 2026
The AMA's 2026 CPT update deleted six branch add-on codes (92921, 92925, 92929, 92934, 92938, and 92944) and revised the base PCI codes to absorb that work. For graft work, 92937 now covers a single major coronary artery and/or its branches, so treating a graft's subtended artery and its branch is one service, not two.
Descriptor wording is AMA copyright, so confirm against your current CPT book. What matters operationally is the logic: one graft, one 92937.
How CPT 92937 Works in Cardiology Billing
Three principles carry most of the weight.
Each graft counts as a major vessel. A sequential or Y-graft with multiple distal anastomoses is still one graft. Treat a second, separate graft in the same session and you report 92937 again for it.
The code is inclusive. Per SCAI's general PCI coding guidance, every PCI code includes accessing and catheterizing the vessel, crossing the lesion, imaging to document completion, closing the arteriotomy through the sheath, and distal embolic protection. Balloon angioplasty is folded in even when a stent is the headline.
Native and graft work on the same artery can both be reported. If one segment of an artery is treated natively and another segment requires access through a graft, the graft intervention is reported separately.
For the rest of the family, our guides on CPT 92928 stent coding, CPT 92933 atherectomy with stent, and the 92920 to 92998 range map show how the neighbors behave.
When to Use CPT 92937
Use it when the intervention is performed in or through a bypass graft, and the clinical picture isn't an acute MI or a chronic total occlusion, which have their own codes.
| Clinical situation | Code to consider |
|---|---|
| Stent, atherectomy, or angioplasty in a stenosed saphenous vein graft | 92937 |
| Intervention through a graft to reach a native vessel lesion | 92937 |
| Graft thrombosis during acute MI | 92941 (with 92973 if mechanical aspiration thrombectomy is performed) |
| Chronic total occlusion of a graft, antegrade only | 92943 |
| Graft CTO, combined antegrade and retrograde | 92945 |
| Same procedure in a native artery | 92928, 92924, 92933 or 92920 |
Billing 92928 when the work was in a graft is a recurring error. It undercodes the service and creates an anatomical mismatch against the op note.
Who Can Bill CPT 92937
The interventional cardiologist who performs the procedure bills the professional claim. The hospital bills its own facility claim, so the two sides must tell the same story. Because this is cath lab work, place of service is typically 21 or 22. Billing rules for other roles (assistants, teaching physicians) depend on payer policy and documentation, so verify before submitting.
Documentation for CPT 92937
Reimbursement follows the documentation, not the procedure. Here is what a reviewer expects to see in the procedure note.
| Element | What the note should show |
|---|---|
| Indication | Symptoms, ischemia testing, or imaging findings that justify intervention |
| Graft identity | Conduit type, target vessel, prior CABG |
| Angiographic findings | Location and severity of the graft or anastomotic lesion, flow status |
| Decision to intervene | Documented, with rationale |
| Intervention | Atherectomy, angioplasty, stent (type and number), embolic protection used |
| Vessel mapping | Graft treated, subtended artery and branches, for modifier selection |
| Result | Post-procedure stenosis and flow |
| Complications | Or a clear statement of none |
| Add-on services | Separate documentation for IVUS/OCT or physiology measurements |
Diagnosis linkage matters as much as the narrative. Graft-specific atherosclerosis codes (the I25.7- family and I25.810) should reflect what the note describes; verify against the current ICD-10-CM set. Our cardiology documentation requirements guide goes deeper on this.
CPT Code 92937 Modifiers
Does CPT 92937 need a modifier? Not by itself. Coronary anatomic modifiers are utilized to indicate to the payer which vessel received treatment, and they frequently determine whether a line gets paid or faces a bundling denial when additional services are included in the claim.
| Modifier | Use with 92937 | Notes |
|---|---|---|
| LC, LD, RC, RI, LM | Identify the artery treated | LC = left circumflex, LD = LAD, RC = right coronary, RI = ramus intermedius, LM = left main. Pick the one matching your documentation. |
| 59 or XS | Usually on the other code, such as a diagnostic cath, when an NCCI edit applies | CMS warns against using these only to bypass an edit. Use anatomic modifiers first. |
| 25 | On the E/M service, not on 92937 | Only for a distinct, separately identifiable E/M on the same day. |
| 76 / 77 | Repeat procedure by same or different physician | Requires documentation of why |
| 78 | Unplanned return to the cath lab | For a corresponding issue during the postoperative phase |
| 22 | Substantially greater work than typical | Needs a clear statement of the extra work. Don't use routinely. |
Modifier indicators in NCCI edits change by code pair and quarter. Check the current edit before assuming a modifier will pay. Our guides on modifier 59 and modifier 25 explain when each is defensible.
CPT 92937 Reimbursement
Reimbursement isn't one number. It depends on the payer, locality, setting, and whether more than one procedure appears on the claim.
Diagnostic catheterization. Diagnostic angiography is separately reportable when no prior study supports the decision to intervene, or when prior imaging is inadequate or the clinical situation has changed. If the cath is already included in the plan, expect bundling.
Add-on services. Several add-ons remain valid with 92937 in 2026, including 92972 (lithotripsy), 92973 (mechanical thrombectomy), 92978 and 92979 (IVUS/OCT), and 93571 and 93572 (flow reserve measurements). Each has its own documentation and once-per-session limits.
Multiple graft interventions. When two separate grafts are treated, expect multiple-procedure payment reductions. Check the multiple-procedure indicator in the fee schedule file.
CPT Code 92937 Medicare Reimbursement
Medicare pays physician services under the Physician Fee Schedule: total RVUs times a locality-adjusted conversion factor. The non-APM conversion factor for 2026 is $33.4009. Published RVU data lists CPT 92937 at about 11.02 work RVUs and 15.68 total RVUs, which works out to roughly $524 at the national level before geographic adjustment.
Two cautions. These figures come from the CMS 2026 relative value file as reproduced by RVU reference tools, so confirm them against your Medicare Administrative Contractor's fee schedule lookup for your locality. And the national figure is a benchmark, not what any specific remittance will show. A 0-day global period is in effect, meaning there's no postoperative package to monitor; however, a same-day E/M requires modifier 25 and separate documentation.
Medicare administrative contractors also publish local coverage articles on PCI billing and coding. Read yours.
Medicare vs Commercial Insurance Considerations
Policies vary by payer. Consider the table as a guideline, not as a strict manual.
| Issue | Medicare | Commercial payers |
|---|---|---|
| Fee basis | Published fee schedule, locality-adjusted | Contract rates, often indexed to Medicare |
| Prior authorization | Generally not required for PCI under traditional Medicare | Often required for elective PCI |
| Medical necessity | National and local coverage policy | Payer clinical policy and criteria, which differ |
| Modifier handling | NCCI edits plus MAC guidance | NCCI-based, but payer edits add their own |
| Code adoption | Follows CMS annual update on January 1 | Systems sometimes lag, so deleted codes may hit odd rejections |
| Appeals | Defined redetermination process | Payer-specific timelines and levels |
Commercial claims reward early eligibility work. Our insurance verification guide and prior authorization guide cover the front end.
Real-World Examples
Example 1: A graft, a stent, along with a branch. A vein graft to the obtuse marginal is stented, and the marginal branch is dilated through the graft. Under the 2026 structure that's a single 92937 with the LC modifier, with both vessels described in the note. Invoicing a second line is an outdated practice that now results in refusals.
Example 2: Two separate grafts. A vein graft to the RCA and another to the LAD are both treated. Each graft is its own major vessel: 92937-RC and 92937-LD, with multiple-procedure reduction on the second.
Example 3: Thrombosed graft in STEMI. The graft becomes blocked during an acute myocardial infarction. This is 92941, not 92937. If mechanical aspiration thrombectomy is performed, 92973 is reportable with it.
Example 4: IVUS in the graft. IVUS guides stent sizing. 92937 plus 92978 can be reported when the imaging is documented with its own interpretation and report, once per session for the initial vessel.
Common Billing Mistakes
| Mistake | Why it hurts | Fix |
|---|---|---|
| Reporting 92938 or 92944 | Deleted for 2026, so rejection | Update charge masters and superbills |
| Using 92928 for graft work | Anatomy conflicts with the note | Map graft procedures to 92937 |
| Missing anatomic modifiers | Weak vessel identification | Require LC/LD/RC/RI at charge entry |
| 59 as a default | Triggers audit attention | Use anatomic modifiers first, 59/XS only when justified |
| Thin op notes | Can't support code or necessity | Use a structured template |
| Billing 92937 for AMI graft PCI | Wrong code family | Use 92941 |
Common Denials
The ones that show up most: invalid or deleted code, bundling into the diagnostic cath or another PCI line, diagnosis that doesn't support the intervention, missing or invalid modifier, and no authorization on commercial plans. Prevention is mostly front-end: verified coverage, correct code set, matched modifiers. For appeals, a clear chart along with a brief coding explanation is more effective than quantity. See our cardiology claim denials guide and denial management service.
Billing Workflow Tips
- Pre-procedure: Verify eligibility and authorization before the case is scheduled.
- Same day: Capture the graft map, devices, and add-on services from the cath report, not from memory.
- Coding review: Compare the report to the charge before release. Check code set, modifiers, units, and diagnosis linkage.
- Claim scrubbing: Run NCCI edits and payer-specific rules. See claims submission and tracking.
- Posting: Post line by line so a reduced multiple-procedure payment isn't mistaken for an underpayment. See payment posting.
- Follow-up: Work aging claims by payer, since cath lab balances are large. Our A/R follow-up guide shows how.
Compliance Checklist
- Procedure note supports every device and vessel billed
- Graft type and target documented
- Diagnosis codes match the clinical indication
- Anatomic modifiers reflect the actual vessel
- No deleted codes in charge master, superbill or EHR
- Add-on codes carry their own documentation
- Modifier 59/XS supported by distinct-service documentation
- Medicare and payer policy reviewed this year
- Periodic internal audit of PCI claims (our cardiology audit checklist is a starting point)
How Professional Cardiology Billing Services Help
PCI claims are high-value and high-scrutiny. A billing partner operating within cardiology identifies discrepancies prior to submission: codes that were deleted still present in a charge master, an absent LC modifier, and a diagnosis that fails to align with the graft anatomy.
At Cardiology Billing Services, interventional cardiology billing sits alongside medical coding review and full revenue cycle management for cardiology, so the coding, claim, and follow-up steps stay connected. If your 2026 PCI denials don't add up, a billing review is a sensible place to start.
Frequently Asked Questions
1. Does CPT 92937 need a modifier?
Not inherently. Anatomic modifiers (LC, LD, RC, RI, LM) identify the vessel, and other modifiers apply only for specific situations such as repeat procedures or unusually high work.
2. How can I make sure CPT 92937 claims get paid?
Verify coverage first, use the 2026 code set, document the graft and devices, link the right diagnosis, apply the correct anatomic modifier, and scrub against NCCI edits.
3. How do Medicare and insurance value CPT 92937?
Medicare uses RVUs times the conversion factor, about $524 nationally before locality adjustment in 2026. Commercial payers pay by contract, commonly tied to Medicare but varying by plan.
4. Am I able to still charge for 92938 alongside 92937?
No. 92938 was deleted effective January 1, 2026, and branch work is now part of 92937.
5. What's the difference between 92937 and 92928?
92928 is native-vessel stenting. 92937 is intervention in or through a bypass graft.
6. Is it possible to bill 92937 together with 92941 for the identical graft?
Not for the same graft or vessel. If the graft was addressed during an acute MI, it is described by 92941.
7. Can I bill a diagnostic cath the same day?
Sometimes, when no prior study supports the decision to intervene or the clinical situation changed. NCCI edits and modifier rules apply.
8. Is distal embolic protection billed separately?
No. It's included when performed.
9. Can IVUS or OCT be reported with 92937?
Yes, using 92978 and 92979 when the imaging is separately documented and reported.
10. What do auditors check first?
That the op note supports the vessel, devices, and medical necessity that the claim reports.
Key Takeaways
- 92937 covers PCI in or through a bypass graft, one code per graft
- 92938 and 92944 were deleted for 2026, and branch work is folded into the base code
- Anatomic modifiers matter more than 59 in most cases
- Medicare's national rate is roughly $524 before locality adjustment; verify your own
- Documentation of graft anatomy and devices decides audits
Conclusion
CPT 92937 looks simple until a graft, a branch, an add-on, and a diagnostic cath land on the same claim. The 2026 revisions removed some complexity and left traps for anyone still billing from last year's habits. Get the code set, documentation, and modifiers right at the front, and the back end mostly takes care of itself. If your team wants a second set of eyes, talk to a billing specialist.
