20200

Surgical removal of a tissue sample from a superficial muscle — tissue located just below the skin surface or just beneath the muscle fascia — for diagnostic laboratory analysis.

Verified May 8, 2026 · 7 sources ↓

Medicare: $241.82
Total RVUs: 7.24
Global, days: 0
Region: General

Drawn from CMSAAPCEmednyNIH

Documentation requirements

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

Source · Editorial brief grounded in 7 cited references ↓

Operative note must identify the specific muscle biopsied by name (e.g., deltoid, vastus lateralis) and anatomic site.
Note must establish tissue depth — 'just below the skin surface' or 'immediately below the fascia' — to support superficial rather than deep designation.
Clinical indication documented in the medical record: muscle weakness, unexplained myopathy, abnormal CK/enzyme levels, or abnormal imaging suggesting muscle pathology.
Specimen disposition documented: confirmation that tissue was submitted to pathology for laboratory analysis.
If same-day E&M is billed, the note must show a separately identifiable evaluation beyond the decision to biopsy to support modifier 25.
For bilateral procedures, the note must document that separate incisions were made on both sides and identify each site independently.

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 50 Bilateral procedure 51 Multiple procedures 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 26 Professional component

What this code covers

Source · Editorial summary grounded in 7 cited references ↓

CPT 20200 covers an open incisional biopsy of superficial muscle tissue, meaning tissue obtained just below the skin or immediately beneath the fascia — not deep to another muscle layer or behind bone. The supervising rule on superficial vs. deep isn't the anatomic name of the muscle biopsied. Deltoid and quadriceps are often called 'superficial muscles,' but a biopsy taken deep to the fascia of those muscles may still qualify as deep (20205). The surgeon's operative note must establish depth, not just muscle identity.

The procedure carries a 000 global period, meaning no pre- or post-op work is bundled — E&M services on the same date require modifier 25 to survive audit. Under NCCI edits, 20200 is a column-two code to 20205: if a deep muscle biopsy is performed at the same site, 20200 bundles into 20205 and cannot be separately reported without modifier 59 establishing a distinct anatomic site or separate encounter.

The code appears most frequently in Plastic and Reconstructive Surgery and Neurosurgery billing, typically to diagnose muscular dystrophy, inflammatory myopathies, metabolic muscle disease, or unexplained myopathy with abnormal enzyme or imaging findings. Pathology codes for processing and interpreting the specimen are billed separately by the performing laboratory or pathologist.

RVU & reimbursement

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

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU	1.42
Practice expense RVU	5.45
Malpractice RVU	0.37
Total RVU	7.24
Medicare national rate	$241.82
Global period	0 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	$241.82
HOPD (APC 5072) Hospital outpatient department	$1,687.37
ASC (PI A2) Ambulatory surgical center (freestanding)	$742.04

Common denial reasons

The recurring reasons claims for CPT 20200 get rejected.

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

Bundling into 20205 when deep and superficial biopsies are billed at the same anatomic site without modifier 59 documenting a distinct site.
Missing or vague depth documentation — operative notes stating only 'muscle biopsy performed' without specifying superficial vs. fascia depth trigger downcoding or denial.
Same-day E&M denied for missing modifier 25 when the visit and biopsy are billed together on a 000 global code.
Laterality not specified on bilateral cases; payers require LT/RT or modifier 50 with supporting documentation of bilateral incisions.
Medical necessity denial when the clinical indication (e.g., abnormal labs, imaging, or symptom duration) is not captured in the referring diagnosis or pre-procedure documentation.

Frequently asked questions

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

01What makes a muscle biopsy 'superficial' for coding purposes — is it the muscle or the depth?

It's the depth, not the muscle name. Tissue taken just below the skin or immediately beneath the fascia is superficial (20200). Tissue obtained deep to another muscle layer or behind bone is deep (20205). A biopsy of the quadriceps — commonly called a superficial muscle — can still be coded 20205 if the surgeon goes deep to the fascia.

02Can 20200 and 20205 be billed together on the same date?

Only if performed at separate anatomic sites. NCCI bundles 20200 as a column-two code to 20205 at the same site. To unbundle, append modifier 59 to 20200 and document distinct sites in the operative note. Billing both at the same location without modifier 59 will result in automatic denial of 20200.

03Does the 000 global period affect same-day E&M billing?

Yes. The 000 global means no pre- or post-op work is bundled, but a same-day E&M still requires modifier 25 to be separately payable. The note must show a separately identifiable evaluation beyond the decision to proceed with the biopsy.

04How do you bill a bilateral superficial muscle biopsy?

Bill 20200 with modifier 50 on a single line, or use LT and RT on separate lines per payer instructions. The operative note must document separate incisions on both sides with each site identified. Medicare reimburses bilateral procedures at 150% of the single-procedure rate.

05Is the pathology interpretation included in 20200?

No. CPT 20200 covers the surgical excision only. The laboratory processing and pathologist's interpretation of the muscle specimen are billed separately under the appropriate pathology codes by whoever performs that work.

06What ICD-10 diagnoses typically support medical necessity for 20200?

Common supporting diagnoses include unspecified myopathy (G72.9), inflammatory myopathy, muscular dystrophy (G71.0x), elevated muscle enzymes without a confirmed diagnosis, and abnormal muscle imaging findings. Payers expect the indication to appear in pre-procedure documentation, not just the operative note.

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 biopsied muscle by name, the tissue depth relative to the fascia, the clinical indication driving the procedure, and specimen disposition — all from dictation. That prevents the two most common audit flags on 20200: an operative note that names the muscle but omits depth (triggering a superficial-vs-deep challenge) and a missing laterality notation when the surgeon operates on one side but fails to document which.

See how Mira captures CPT 20200 documentation