21932

Surgical removal of a subfascial (e.g., intramuscular) soft tissue tumor of the back or flank measuring less than 5 cm at its greatest excised diameter including margins.

Verified May 8, 2026 · 6 sources ↓

Medicare: $627.27
Total RVUs: 18.78
Global, days: 90
Region: Other

Drawn from CMSFacsNIHBedrockbillingAAPC

Documentation requirements

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

Source · Editorial brief grounded in 6 cited references ↓

Confirm tumor location is subfascial (below the fascia, e.g., intramuscular) — not subcutaneous or cutaneous in origin
Record greatest excised diameter of the tumor plus the required margin at time of excision, confirming the total is less than 5 cm
Specify the anatomic site as back or flank; generic 'posterior trunk' is insufficient for audit defense
Document the tissue depth reached during dissection to support subfascial classification over superficial codes
Include pathology report correlating with the operative specimen to confirm non-cutaneous soft tissue origin
If modifier 22 is appended, document specific factors increasing complexity — adhesions, neurovascular proximity, prior radiation — and estimate additional operative time

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 58 Staged or related 59 Distinct service 76 Repeat, same physician 77 Repeat, another physician 78 Unplanned return — related 79 Unrelated during global 80 Assistant surgeon LT Left side RT Right side

What this code covers

Source · Editorial summary grounded in 6 cited references ↓

CPT 21932 covers excision of a deep soft tissue tumor of the back or flank located below the fascia — think intramuscular lipomas, desmoids, or other subfascial masses — where the tumor plus the required excision margin measures less than 5 cm. Depth is the defining split: superficial tumors above the fascia go to 21930 (less than 3 cm) or 21931 (3 cm or greater); subfascial tumors under 5 cm land on 21932; subfascial tumors 5 cm or greater go to 21933. Size is measured at the time of excision as the greatest diameter of the tumor plus the narrowest margin needed for complete removal.

Code selection errors cluster around two mistakes: using the superficial skin-lesion codes (11400–11446) for what is actually a deep subfascial mass, and misclassifying cutaneous-origin lesions (sebaceous cysts, epidermal inclusion cysts) under musculoskeletal tumor codes. CPT guidelines are explicit — cutaneous-origin benign lesions belong in the 11400 series regardless of anatomic location. The operative note must establish subfascial depth and confirm the measured size to survive audit.

The 90-day global period applies. All routine follow-up through day 90 is bundled. A separate, unrelated E/M or procedure in that window requires modifier 24 or 79, respectively. If increased complexity — dense adhesions, proximity to neurovascular structures, prior radiation field — significantly extends intraoperative work, modifier 22 applies with supporting documentation quantifying the additional time and difficulty.

RVU & reimbursement

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

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU	9.57
Practice expense RVU	6.96
Malpractice RVU	2.25
Total RVU	18.78
Medicare national rate	$627.27
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	$627.27
HOPD (APC 5073) Hospital outpatient department	$2,967.63
ASC (PI G2) Ambulatory surgical center (freestanding)	$1,248.36

Common denial reasons

The recurring reasons claims for CPT 21932 get rejected.

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

Wrong code family: cutaneous-origin lesions (e.g., sebaceous or epidermal inclusion cysts) coded to 21932 instead of 11400–11446
Size not documented: operative note lacks a measured greatest diameter plus margin, making the less-than-5-cm threshold unverifiable
Depth not established: note describes the tumor as subcutaneous rather than subfascial, misaligning with the code descriptor
Unbundling error: excision reported alongside separately billed wound closure or pathology services that are already included
Global period conflict: a routine follow-up E/M billed within 90 days without modifier 24, triggering automatic denial

Frequently asked questions

Source · Generated from the editorial pipeline, verified against 6 cited references ↓

01How is tumor size measured for 21932?

Size equals the greatest diameter of the tumor plus the narrowest margin required for complete excision, measured at the time of the procedure — not from preoperative imaging. If that combined measurement is less than 5 cm and the tumor is subfascial, 21932 applies. At 5 cm or greater, use 21933.

02Can I use 21932 for an intramuscular lipoma of the back?

Yes, provided it meets the subfascial depth and less-than-5-cm size criteria. Document depth of dissection explicitly in the operative note. A lipoma sitting above the fascia belongs in the superficial series (21930–21931).

03Should I use 21932 or 11406 for a large back lesion?

Depends on origin and depth. Cutaneous-origin lesions — including sebaceous cysts and epidermal inclusion cysts — use 11400–11446 regardless of size or back location. 21932 is reserved for non-cutaneous soft tissue tumors confirmed to be subfascial. The operative note and pathology report together determine the correct family.

04What global period applies, and what's bundled in it?

21932 carries a 90-day global period. That includes the day-before preoperative visit, the surgery itself, and all routine postoperative care through day 90 — dressings, suture removal, wound checks. Bill an unrelated E/M in that window with modifier 79; bill a related return to the OR with modifier 78.

05When does modifier 22 apply to 21932?

When the operative work is substantially greater than typical — documented reasons include dense fibrosis, proximity to major neurovascular structures, or a previously irradiated field. Attach a cover letter quantifying the extra time and complexity. Without supporting narrative, payers routinely reject modifier 22 claims for soft tissue excisions.

06Is 21932 billed differently in a hospital outpatient department versus an ASC?

Yes. The site of service affects facility payment rates — see the Site of Service comparison on this page for HOPD versus ASC amounts. The physician's professional fee uses the same CPT code regardless of setting, but the facility payment differs materially between the two. Consider ASC when clinically appropriate if cost matters to your patient.

Sources & references

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

Mira AI Scribe

Mira's AI scribe captures tumor anatomic site (back vs. flank), tissue depth relative to the fascia (subfascial/intramuscular vs. subcutaneous), and the measured greatest diameter of the tumor plus excision margin at time of removal. It flags operative notes that describe the lesion as cutaneous in origin — routing those to the 11400 series instead — and alerts when no size measurement is recorded, the most common audit trigger for this code.

See how Mira captures CPT 21932 documentation