CPT code 27630 – Excision of tendon sheath lesion

Key takeaways

CPT code 27630 covers excision of a lesion from a tendon sheath or joint capsule in the leg or ankle. Foot lesions use 28090.

Ganglion cysts and Achilles tendon sheath lesions are the most common clinical scenarios billed under this code.

Missing LT or RT modifiers and site errors, such as a foot lesion documented as leg, are the top denial triggers for 27630.

The 2026 Medicare facility RVUs for 27630 total 10.38, and the code carries a 90-day global period.

Pabau, the practice management system we build, submits claims electronically through Claim.MD and tracks each claim’s status.

CPT code 27630: official descriptor and clinical scope

CPT code 27630 describes excision of a tendon sheath or capsule lesion in the leg or ankle, as defined in the AMA’s CPT code set. Within Surgery CPT codes, it sits in the Musculoskeletal System section. Specifically, its subsection is Excision Procedures on the Leg (Tibia and Fibula) and Ankle Joint, range 27613-27647.

The parenthetical examples in the descriptor (“e.g., cyst or ganglion”) are examples only, not a full list. Also, any distinct lesion starting from a tendon sheath or joint capsule in the leg or ankle can qualify. However, the operative note has to support the excision.

Lesion types and anatomy the code covers

CPT code 27630 covers surgical removal of a benign lesion that originates from a tendon sheath or joint capsule in the leg or ankle. In other words, the structure being excised must be the sheath or capsule itself, not overlying soft tissue or skin.

Common lesion types covered:

• Ganglion cysts: the most frequent clinical scenario, mostly at the ankle joint or peroneal tendon sheath
• Synovial cysts: starting from the synovial lining of the tendon sheath
• Fibromas of the tendon sheath: benign fibrous nodules attached to the sheath
• Achilles tendon sheath lesions: per AAPC guidance, excision of a lesion within the Achilles tendon sheath in the leg qualifies under this code

In practice, the covered region is the lower leg and ankle, running from below the knee to (but not including) the foot proper. So when the ganglion or cyst lies at the ankle, 27630 applies. However, when the same cyst type is located on the dorsum of the foot or at the MTP joint, another code governs.

What 27630 does not cover

Two facts set the code’s limit: the tissue the lesion arises from, and its site. The decision chart below routes each case to its code, and the table then explains why 27630 fails for each alternative.

What the operative note must document

The operative note is the claim’s foundation. A well-constructed note for CPT code 27630 supports clean claim submission. As a result, it prevents the most common denials tied to documentation.

The note must therefore establish all of these:

• Lesion location: clearly state the body site as leg or ankle, not foot. Vague language like “lower extremity” is insufficient, because it often triggers downcoding.
• Structure involved: name the tendon sheath or joint capsule as the structure of origin. Documentation that says only “soft tissue lesion” gives the payer no basis to confirm the code.
• Lesion type: state the lesion (ganglion cyst, synovial cyst, fibroma) as confirmed intraoperatively.
• Excision confirmed: the note must state the lesion was fully excised, rather than just aspirated or injected.
• Laterality: document left or right. Indeed, missing this single element is one of the most frequent reasons laterality modifiers are omitted from the claim.

Next, include a superbill that maps the confirmed diagnosis to the CPT code. Payers cross-reference the operative note against the claim. Therefore, mismatches between the two are a main audit trigger.

ICD-10 codes often paired with 27630

Selecting the right ICD-10-CM diagnosis code is as important as the CPT code itself. For this reason, payer edits check that the diagnosis and procedure are clinically linked. The table below also covers the most often paired codes and their laterality variants.

Check ICD-10-CM code pairing rules with each payer. Also, some commercial plans require imaging (MRI or ultrasound) to appear in the record as supporting evidence before approving the diagnosis-to-procedure link.

Modifiers for 27630 and when to apply them

Modifiers signal clinical context to the payer. In practice, these modifiers are the ones most often required for CPT code 27630.

Modifier 59, in particular, requires careful use. NCCI edits are updated each quarter by CMS, so check current edit pairs before billing 27630 with another code in the same session. Also, check the CMS Physician Fee Schedule lookup tool for the latest bundling restrictions.

Adjacent and often confused codes

The codes most often confused with CPT code 27630 sit in the same musculoskeletal subsection or cover nearby body sites. A side-by-side comparison therefore prevents miscoding.

The split between 27630 and 28090 is the most important in practice. So the operative note must clearly state whether the surgical site is within the leg or ankle or on the foot. In addition, code borderline cases at the ankle-foot junction by the main body structure excised, and document that determination.

2026 Medicare reimbursement for CPT code 27630

Medicare reimbursement for CPT code 27630 is set through the annual CMS Physician Fee Schedule. The 2026 national RVUs below come from the CMS file as listed on FastRVU, and payment varies by geographic pricing locality. Therefore, check with your Medicare Administrative Contractor (MAC) before quoting expected payment to providers.

Commercial payer rates for 27630 vary widely from Medicare national averages. For example, rates often range from 110% to 150% of Medicare based on the contract. Moreover, submitting claims through a clearinghouse reduces submission errors and speeds ERA receipt for this procedure.

Prior authorization and common denial reasons

Prior authorization rules

Medicare does not require prior authorization for CPT code 27630. However, commercial payers vary: many require pre-authorization for elective soft-tissue excision, especially when the procedure is performed in an ASC setting. Prior authorization rules depend on each plan and region, so check with each payer before booking.

When a commercial plan does require pre-auth, the clinical submission often needs:

• MRI or diagnostic ultrasound showing the lesion and its site (leg/ankle, not foot)
• Documentation of failed conservative management (aspiration, physical therapy, bracing) over a specified period, often 6 weeks or more
• Surgeon credentials confirming specialty eligibility (orthopedic surgery or, based on state scope-of-practice laws and payer credentialing, podiatric surgery)

Common denial reasons and prevention

Effective denial management in healthcare starts with knowing which errors consistently trigger rejections. Specifically, for CPT 27630, the highest-frequency denial patterns are:

• Wrong body site: operative note documents “foot” when the code requires “leg or ankle.” Prevention: use a documentation checklist that requires explicit site confirmation before the claim is built.
• Missing laterality modifier: LT or RT not appended. Prevention: configure billing software so it flags 27630 claims without a laterality modifier at scrubbing.
• ICD-10 mismatch: diagnosis code does not support the procedure (e.g., using a foot ganglion code with a leg excision CPT). Prevention: confirm the ICD-10-CM code matches the documented body site of 27630.
• Bundling without modifier 59: 27630 billed with a companion musculoskeletal code that is subject to NCCI edits, without the required modifier. Prevention: run NCCI edit check before submission.
• Missing prior authorization: commercial plan required pre-auth but none was obtained. Prevention: check authorization rules at the time of booking, not day-of.

Finally, pair these checks with a medical billing compliance review cycle to catch documentation patterns that create recurring denials.

Bundling 27630 with other procedures

CPT code 27630 can be billed with other orthopedic codes on the same date, but NCCI edits govern when a separate payment is permitted. In short, the key principle: procedures must be performed at clearly separate body sites, or the pair must not be subject to a column 1/column 2 bundling edit.

Common scenarios and their billing treatment:

• 27630 + 29898 (ankle arthroscopy): check current NCCI edits. If a bundling edit exists, modifier 59 or the more precise X modifiers may allow separate payment. However, that applies only when the excision and arthroscopy address distinct components of the procedure. Also, both the sheath excision and the arthroscopic work must be separately documented.
• 27630 + 20680 (implant removal, deep): often billable separately when hardware is at another body site from the tendon sheath lesion. Therefore, document both sites clearly.
• 27630 + 27603 (I&D, deep abscess or hematoma, leg or ankle): billing 27603 at the same site as 27630 is a bundling risk. If the procedures are truly separate (other sites, other structures), modifier 59 with complete documentation supports unbundling.

Check current edit tables at the AAPC Codify CPT lookup before billing any code pair involving 27630. NCCI edits update each quarter, and commercial payers may also apply their own bundling logic beyond the standard Medicare edits.

How Pabau supports clean 27630 claims

The denials in this article share one cause: the operative note and the claim disagree on site, side, or diagnosis. Billing teams often catch that by reading the note against the claim line by line, days after surgery.

In contrast, Pabau keeps the operative note, the diagnosis, and the invoice on the same patient record. Its claims management software then submits the claim electronically through Claim.MD and tracks its status from submission to payment.

As a result, fewer claims are built from memory, and the path from a rejection back to the note is shorter.

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Conclusion

Code 27630 comes down to two facts in the operative note: what the lesion arose from, and where it sat. Get both on paper before the claim is built, and the foot, knee, bone, and skin alternatives drop away.

The trade-off is a little more time at the point of documentation. However, a surgeon who names the ankle, the sheath, and the side in the note saves the billing team a query and the practice a resubmission.

Pabau keeps that note and the claim on one patient record, then submits through Claim.MD and tracks each claim’s status. Book a demo to see how it fits your orthopedic billing workflow.

Continue your research

Need a systematic approach to claim rejections? Denial management in healthcare covers the framework for tracking, appealing, and preventing recurring claim denials across specialties.

Handling electronic remittance after 27630 claims are paid? Electronic remittance advice explains how to read ERA files, reconcile payments, and identify underpayments from the 835 transaction.

Submitting 27630 claims through a clearinghouse? Medical claims clearinghouse explains how clearinghouses validate claims before they reach payers and which submission formats reduce scrub-related rejections.

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