Surgical · Spine

Add-on code for each additional interspace decompressed during laminotomy with nerve root or disc excision in the cervical or lumbar spine.

Verified May 8, 2026 · 5 sources ↓

Medicare: $206.42
Total RVUs: 6.18
Global, days
Region: Spine

Drawn from CMSMedtronicAAOSMdclarity

Documentation requirements

What must appear in the operative or office note to support the claim.

Source · Editorial brief grounded in 5 cited references ↓

Operative note must identify each interspace treated by level (e.g., L4-5, L5-S1) — vague references to 'additional levels' are not sufficient.
Document the specific nerve root(s) decompressed or disc material excised at each interspace.
Clearly state the surgical approach and confirm direct visualization at each reported interspace.
Indicate the primary laminotomy code being performed at the index level so the add-on context is unambiguous.
Record whether the procedure was unilateral or bilateral at each interspace, as this affects modifier assignment on the primary code.

Applicable modifiers

Modifiers commonly billed with this code.

Source · AMA CPT modifier descriptors · CMS NCCI Policy Manual

22 Increased complexity 50 Bilateral procedure 62 Co-surgeons 80 Assistant surgeon AS PA/NP/CNS assistant LT Left side RT Right side

What this code covers

Source · Editorial summary grounded in 5 cited references ↓

63035 is an add-on code reported once per additional interspace treated during a laminotomy with nerve root decompression or disc excision. It is never billed alone — it requires a primary laminotomy code such as 63030 (lumbar) or 63020 (cervical). The ZZZ global period means 63035 folds into the global period of the primary procedure it accompanies; no separate post-op period is assigned to the add-on itself.

In lumbar procedures, 63035 is commonly paired with 63030 when the surgeon decompresses more than one interspace during the same session. In cervical procedures, it pairs with 63020. Each additional interspace beyond the first gets one unit of 63035 — two additional interspaces means two units, subject to MUE limits. For bilateral work at a single interspace, modifier 50 applies to the primary code, not 63035; confirm bilateral add-on reporting with your payer before submitting.

This code appears most frequently in orthopedic surgery and neurosurgery claims. Because it is an add-on, modifier 51 is not appended. NCCI edits govern what can and cannot be reported alongside the primary-plus-add-on pair; review the NCCI procedure-to-procedure edits table before adding other spinal decompression codes to the claim.

RVU & reimbursement

Component RVUs and Medicare national rate. Actual payment varies by GPCI locality.

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU	3.76
Practice expense RVU	1.25
Malpractice RVU	1.17
Total RVU	6.18
Medicare national rate	$206.42
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	$206.42

Common denial reasons

The recurring reasons claims for CPT 63035 get rejected.

Source · Editorial brief grounded in CMS NCCI edits, AAOS coding appeals, and cited references ↓

Billed without a primary laminotomy code — 63035 cannot stand alone and will reject without the base procedure.
Units exceed payer or MUE limits when multiple additional interspaces are reported; submit with documentation supporting medical necessity for each level.
Operative note does not individually identify and describe the work performed at each additional interspace, prompting a medical necessity denial.
Modifier 51 appended in error — 63035 is an add-on code exempt from multiple-procedure reduction.
Payer bundles 63035 into the primary code when the operative note fails to clearly distinguish separate decompression work at distinct levels.

Frequently asked questions

Source · Generated from the editorial pipeline, verified against 5 cited references ↓

01Can 63035 be billed without a primary laminotomy code?

No. 63035 is an add-on code and must always accompany a primary laminotomy procedure such as 63030 (lumbar) or 63020 (cervical). Claims submitted with 63035 as a standalone will reject.

02How many units of 63035 can be reported in one session?

One unit per additional interspace decompressed beyond the primary level. Two additional interspaces = two units. Check your payer's MUE limit and document each interspace individually in the operative note.

03Should modifier 51 be appended to 63035?

No. 63035 is exempt from modifier 51 as an add-on code. Appending 51 can trigger an incorrect multiple-procedure reduction. Bill it without modifier 51.

04How does the ZZZ global period affect billing for 63035?

ZZZ means 63035 carries no independent global period — it rolls into the global period of the primary procedure it accompanies. Post-op visits related to the surgery are governed by the primary code's global, not 63035.

05When should modifier 22 be used with 63035?

Use modifier 22 on the primary procedure code when the total operative work is substantially greater than typical — for example, severe epidural fibrosis or anatomy significantly distorted by prior surgery. Document the specific factors that increased operative time and complexity. Apply 22 to the primary code; payer policies vary on whether 22 is accepted on add-on codes.

06Can 63035 be used for both cervical and lumbar additional interspaces?

Yes. 63035 applies to additional interspaces in either cervical or lumbar laminotomy procedures. The primary code (63020 for cervical, 63030 for lumbar) dictates the anatomic context.

07Is modifier 62 ever appropriate with 63035?

Yes, when two surgeons of different specialties perform the laminotomy as co-surgeons. Both surgeons append modifier 62 to the primary and add-on codes, and each must document their distinct intraoperative role. Not all payers recognize co-surgery on add-on codes — verify before submitting.

Sources & references

Editorial content was developed using the following public sources. Last verified May 8, 2026.

Mira AI Scribe

Mira's AI scribe captures each interspace level by name (e.g., L4-5, L5-S1), the specific nerve root decompressed or disc material removed at each level, laterality, and the primary procedure code context from the surgeon's dictation. This prevents the most common denial driver for 63035: an operative note that references 'additional levels' without level-specific decompression detail, which auditors flag and payers use to bundle or downcode the claim.

See how Mira captures CPT 63035 documentation