Open division of the sternocleidomastoid muscle to correct torticollis, performed without cast application.

Verified May 8, 2026 · 7 sources ↓

Medicare: $574.50
Work RVU: 5.66
Global, days: 90
Region: Other

Drawn from CMSAAPCFindacodeMdclarityBedrockbilling

Documentation requirements

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

Source · Editorial brief grounded in 7 cited references ↓

Diagnosis of torticollis with clinical findings supporting surgical necessity (head tilt direction, affected muscle, duration of symptoms)
Documentation of prior conservative treatment attempted and failed (e.g., PT, botulinum toxin injection, bracing)
Operative note specifying open approach, confirmation of SCM division, and that no cast was applied
Laterality clearly documented — left, right, or bilateral — to support modifier assignment
Pre-operative photographs or imaging supporting the severity and structural basis of the deformity when available
Post-operative plan including physical therapy or stretching protocol to prevent recurrence

Applicable modifiers

Modifiers commonly billed with this code.

Source · AMA CPT modifier descriptors · CMS NCCI Policy Manual

22 Increased complexity 50 Bilateral procedure 51 Multiple procedures 52 Reduced services 59 Distinct service 76 Repeat, same physician 77 Repeat, another physician 78 Unplanned return — related 79 Unrelated during global LT Left side RT Right side XS Separate structure

What this code covers

Source · Editorial summary grounded in 7 cited references ↓

CPT 21720 describes an open surgical procedure in which the sternocleidomastoid (SCM) muscle is divided — not simply released or injected — to correct torticollis, the condition causing involuntary head tilt and neck muscle contracture. The procedure is performed through a direct open incision, and no cast is applied as part of the service. It falls under the repair, revision, and/or reconstruction procedures on the neck soft tissues and thorax section of CPT.

The 90-day global period covers all routine post-op care through day 90. Any return to the OR for a related complication (e.g., hematoma evacuation, wound dehiscence management) bills with modifier 78. An unrelated procedure during the global period needs modifier 79. A same-day E/M tied to the decision for surgery requires modifier 57.

Site of service matters here: HOPD and ASC payments differ substantially — see the Site of Service comparison table. The procedure is typically performed in an outpatient or ASC setting. Payer prior authorization requirements vary; confirm before scheduling, as some commercial payers require documented failure of conservative measures including physical therapy and/or botulinum toxin injections.

RVU & reimbursement

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

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU vs. total RVU

The work RVU (5.66) is the surgeon's own effort — the figure physician pay and productivity targets are built on. The total RVU (17.2) adds practice overhead and malpractice, and is what drives the Medicare payment below.

Work RVU	5.66
Practice expense RVU	9.16
Malpractice RVU	2.38
Total RVU	17.2
Medicare national rate	$574.50
Global period	90 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	$574.50
HOPD (APC 5113) Hospital outpatient department	$3,342.87
ASC (PI A2) Ambulatory surgical center (freestanding)	$1,644.87

Common denial reasons

The recurring reasons claims for CPT 21720 get rejected.

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

Missing documentation of failed conservative management prior to surgical intervention
Laterality not specified on the claim, causing payer edit for missing LT or RT modifier
Bundling denial when ancillary soft-tissue procedures performed at the same site are not supported by modifier 59 or XS with adequate documentation
Medical necessity denial when the operative note lacks objective clinical findings quantifying the torticollis deformity
Global period violation — routine post-op services billed separately without modifier 24 showing an unrelated diagnosis

Frequently asked questions

Source · Generated from the editorial pipeline, verified against 7 cited references ↓

01Is modifier 50 appropriate when both SCMs are divided in one session?

Yes. If the surgeon divides both sternocleidomastoid muscles in the same operative session, modifier 50 applies. Document bilateral involvement in both the pre-op diagnosis and operative note. Some payers require LT and RT on separate line items instead of modifier 50 — verify payer preference before submitting.

02What ICD-10 codes pair with 21720?

M43.6 (Torticollis) is the primary pairing. Congenital muscular torticollis maps to Q68.0. Spasmodic torticollis (G24.3) may apply for dystonic presentations. Payers will scrutinize the ICD-10 for specificity — 'neck pain' alone will not support medical necessity for an open surgical procedure.

03Does the global period include post-op physical therapy?

No. PT services are not part of the surgical global package and bill separately under their own CPT codes regardless of the global period. The 90-day global covers the operating surgeon's post-op E/M visits and wound care only.

04When is modifier 22 justified for 21720?

Modifier 22 is justified when the procedure required substantially greater work than typical — for example, dense fibrosis from prior failed surgery, significant anatomical distortion, or prolonged operative time well beyond the norm. The operative note must describe the specific factors that increased complexity; a vague reference to 'difficult anatomy' will not hold up to audit review.

05Can 21720 be billed during the global period of another neck procedure?

Only with the correct modifier. If 21720 is unrelated to the original procedure, use modifier 79. If it represents an unplanned return to the OR for a complication related to the original procedure, use modifier 78. Do not bill it without a modifier during any active global period — it will deny as included.

06Is prior authorization typically required for this procedure?

Many commercial payers require prior authorization and documented failure of conservative treatment (physical therapy, botulinum toxin injections, or cervical bracing) before approving open surgical intervention. Medicare does not have a specific NCD for torticollis surgery, but MACs may apply local coverage criteria. Confirm payer-specific requirements before scheduling.

Sources & references

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

Mira Scribe

Mira's AI scribe captures the operative approach (open SCM division), laterality, absence of cast application, and the specific torticollis presentation including head tilt direction and affected muscle from dictation. It flags when the note omits prior conservative treatment attempts — the most common trigger for a medical necessity denial on this code.

See how Mira captures CPT 21720 documentation