Add-on code for bone the surgeon harvests from the same spinal operative field (lamina, spinous process, facet bone) and uses as fusion graft material.
- Medicare
- $0.00
- Work RVU
- 0
- Global, days
- Region
- Spine
Documentation requirements
What must appear in the operative or office note to support the claim.
Source · Editorial brief grounded in 3 cited references ↓
- Statement that graft bone came from the same incision (for example, the lamina or spinous process removed during decompression)
- Primary arthrodesis code and levels fused
- Where the graft was placed (interbody, posterolateral gutters)
- Any allograft or biologic mixed in, listed separately
- No mention of a separate fascial incision for harvest
What this code covers
Source · Editorial summary grounded in 3 cited references ↓
20936 reports local autograft: bone the surgeon removes during the decompression or exposure and then packs into the fusion bed. No separate incision is made to get it. If the surgeon opens a separate fascial incision over the iliac crest, that is 20937 or 20938, not this code.
It is an add-on, so it only goes on a claim with a primary spinal fusion code from the arthrodesis families. Report it once per operative session, not once per level. Medicare assigns it status B, which means payment is bundled into the fusion and you will not see a separate allowable. Plenty of commercial payers bundle it the same way. A few still want the line on the claim for completeness, so check the contract before dropping it.
The usual mistake is reporting 20936 for allograft or bone substitute. Those go to 20930 or 20931 (also add-ons, also bundled by Medicare). If the note says the surgeon used morselized lamina mixed with allograft chips, you can report both the autograft and allograft codes when the payer recognizes them.
RVU & reimbursement
Component RVUs and Medicare national rate. Actual payment varies by GPCI locality.
Source · CMS Physician Fee Schedule, RVU26A · January 2026
| Work RVU | 0 |
| Practice expense RVU | 0 |
| Malpractice RVU | 0 |
| Total RVU | 0 |
| Medicare national rate | $0.00 |
| Global period | days |
Payment by site of service
Medicare pays different rates by setting. HOPD typically pays substantially more than ASC for the same procedure.
Source · CMS OPPS Addendum B·ASC HCPCS payment rates·2026
| Setting | Medicare rate (national) |
|---|---|
Office (PFS non-facility) Procedure performed in physician's office | $0.00 |
Common denial reasons
The recurring reasons claims for CPT 20936 get rejected.
Source · Editorial brief grounded in CMS NCCI edits, AAOS coding appeals, and cited references ↓
- Billed to Medicare expecting payment when the code is bundled (status B)
- Reported without a primary fusion code on the same claim
- Reported per level instead of once per session
- Billed with 20937 or 20938 for the same graft when only one harvest site was documented
- Used for allograft or synthetic material instead of patient bone
Frequently asked questions
Source · Generated from the editorial pipeline, verified against 3 cited references ↓
01Does Medicare pay for CPT 20936?
02Can 20936 be billed per level?
03What is the difference between 20936 and 20937?
04Can I bill 20936 and 20930 together?
Sources & references
Editorial content was developed using the following public sources.
Mira Scribe
Mira Scribe records where the graft bone came from and where it went, so the op note separates local autograft from iliac crest harvest and allograft without a query to the surgeon.
See how Mira captures CPT 20936 documentation