Open biopsy of deep soft tissue in the upper arm or elbow region, requiring dissection below the fascia to obtain a tissue sample for pathologic analysis.

Verified May 8, 2026 · 5 sources ↓

Medicare: $686.39
Total RVUs: 20.55
Global, days: 90
Region: Elbow

Drawn from CMSFindacode

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 specify depth of dissection — explicitly state that dissection extended below the fascia to reach deep soft tissue.
Describe the anatomic location within the upper arm or elbow (e.g., proximal humerus, lateral epicondyle region, posterior compartment).
Document the indication for biopsy, including prior imaging findings (ultrasound, MRI) that identified the lesion and drove the surgical decision.
Record the size and gross characteristics of the tissue specimen as observed intraoperatively.
Pathology report must be ordered and correlated; operative and pathology notes should be maintained together in the record.
If same-day E&M is billed with modifier 25, document a separate, distinct clinical evaluation unrelated to the biopsy decision in that encounter note.

Applicable modifiers

Modifiers commonly billed with this code.

Source · AMA CPT modifier descriptors · CMS NCCI Policy Manual

22 Increased complexity 25 Significant separate E/M 51 Multiple procedures 52 Reduced services 57 Decision for surgery 58 Staged or related 59 Distinct service 78 Unplanned return — related 79 Unrelated during global 80 Assistant surgeon LT Left side RT Right side XS Separate structure

What this code covers

Source · Editorial summary grounded in 5 cited references ↓

CPT 24066 covers a deep soft tissue biopsy of the upper arm or elbow area. 'Deep' means the surgeon dissects through fascia to reach the lesion — this is not a superficial punch or needle biopsy. The procedure is performed when imaging has identified a mass and histologic confirmation is needed to rule out malignancy or characterize a soft tissue tumor.

The 90-day global period means all routine follow-up — including the wound check and suture removal — is bundled into the surgical payment. Any E&M visit on the same day as the biopsy requires modifier 25 if it's a significant, separately identifiable service unrelated to the biopsy decision itself. The decision to perform the biopsy doesn't independently justify a same-day E&M charge.

Site of service matters here: the HOPD rate and ASC rate differ substantially (see the Site of Service comparison table). If the procedure is planned for an ASC, confirm the facility is contracted and that the operative note will clearly support the deep dissection — payers will downcode to a superficial biopsy code if depth isn't documented.

RVU & reimbursement

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

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU	5.22
Practice expense RVU	14.13
Malpractice RVU	1.2
Total RVU	20.55
Medicare national rate	$686.39
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	$686.39
HOPD (APC 5073) Hospital outpatient department	$2,967.63
ASC (PI A2) Ambulatory surgical center (freestanding)	$1,248.36

Common denial reasons

The recurring reasons claims for CPT 24066 get rejected.

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

Depth not documented — payer downcodes to a superficial soft tissue biopsy code when the operative note doesn't explicitly confirm subfascial dissection.
Same-day E&M denied for missing or insufficient modifier 25 support — the note doesn't demonstrate a separately identifiable service beyond the biopsy decision.
Incorrect site-of-service billing — procedure billed under a facility rate the payer doesn't recognize as appropriate for the performing location.
Missing or delayed pathology report correlation — some payers flag surgical biopsy claims when no pathology result is on record, treating the claim as incomplete.
Bundling conflict when additional arm or elbow procedures are billed same-day without a modifier establishing a distinct service or separate anatomic site.

Frequently asked questions

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

01What makes this a 'deep' biopsy versus a superficial one?

Deep means dissection through the investing fascia into the underlying soft tissue compartment. If the lesion is above the fascia, a different, lower-valued biopsy code applies. The operative note must state the fascial layer was traversed — don't assume the payer will infer depth from the lesion size or imaging description.

02Can I bill a same-day E&M with 24066?

Yes, but only with modifier 25 on the E&M, and only if the visit was a significant, separately identifiable service unrelated to the decision to biopsy. The evaluation that led directly to scheduling the biopsy is bundled. Document a distinct clinical problem or workup in the E&M note to support the modifier.

03Does the 90-day global period affect how I bill post-op visits?

Yes. All routine post-op care through day 90 is included in 24066's global package — wound checks, suture removal, dressing changes. Bill post-op visits unrelated to the biopsy with modifier 24, and complications requiring a return procedure with modifier 78 (related, unplanned) or 79 (unrelated).

04Is image guidance separately billable with 24066?

Only if imaging guidance was used for a separate procedure on the same date — not for the biopsy itself unless the code descriptor or payer policy explicitly permits it. Per NCCI policy, if imaging is integral to the procedure, it cannot be separately reported. Check your payer's specific guidance and document the distinct use case if billing separately.

05Can 24066 be billed bilaterally?

Bilateral arm biopsies on the same date are unusual and would require strong clinical justification. If performed, append modifier 50 (bilateral) or use LT/RT on separate line items per payer preference. Expect scrutiny — document separate lesions and separate anatomic sites clearly in the operative note.

06What if the procedure was more extensive than typical — can I use modifier 22?

Yes, if the dissection was substantially more difficult than the standard service — for example, due to proximity to neurovascular structures, unusually large or adherent tumor, or prior surgical scarring requiring extensive work. Attach a cover letter describing the added complexity. Modifier 22 without supporting documentation is a frequent audit trigger.

Sources & references

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

Mira AI Scribe

Mira's AI scribe captures the approach and depth of dissection directly from dictation — recording that the surgeon carried dissection through the fascia to expose deep soft tissue, the anatomic sub-region within the upper arm or elbow, lesion characteristics observed, and specimen handling instructions. This prevents the single most common denial for 24066: an operative note that describes a biopsy without confirming subfascial depth, triggering a payer downcode to a superficial code.

See how Mira captures CPT 24066 documentation