Excision of a chest wall tumor involving one or more ribs, with plastic reconstruction of the chest wall defect and mediastinal lymphadenectomy.

Verified May 8, 2026 · 6 sources ↓

Medicare: $1,672.05
Total RVUs: 50.06
Global, days: 90
Region: Other

Drawn from CMSAAPCFindacodeHiacodeMedisysdata

Documentation requirements

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

Source · Editorial brief grounded in 6 cited references ↓

Operative note must identify specific rib(s) involved and confirm full-thickness chest wall resection.
Reconstruction method must be documented by name — myocutaneous flap, mesh, bone graft, or prosthetic material.
Mediastinal lymphadenectomy must be explicitly described, including node stations sampled or dissected.
Pathology report confirming tumor type, size, and margins to support medical necessity and any modifier 22 use.
Pre-operative imaging (CT or PET-CT) linking tumor location to rib involvement and mediastinal nodes.
If the procedure is performed in the context of a concurrent mastectomy, document each procedure separately with its own indication.

Applicable modifiers

Modifiers commonly billed with this code.

Source · AMA CPT modifier descriptors · CMS NCCI Policy Manual

22 Increased complexity 51 Multiple procedures 58 Staged or related 62 Co-surgeons 78 Unplanned return — related 79 Unrelated during global 80 Assistant surgeon AS PA/NP/CNS assistant

What this code covers

Source · Editorial summary grounded in 6 cited references ↓

21603 covers the most extensive of the three-tier chest wall tumor excision series (21601–21603). The surgeon removes the tumor along with the involved rib(s), reconstructs the resulting chest wall defect using myocutaneous flaps, bone grafts, or prosthetic materials, and performs a mediastinal lymphadenectomy. That lymph node dissection is what distinguishes 21603 from 21602 — omit it and you're in 21602 territory.

These codes migrated from the integument section (formerly 19260–19272) to the Musculoskeletal System in 2020 when the old mastectomy-associated codes were deleted. The clinical intent didn't change; only the code numbers and section placement did. This context matters for payers still crosswalking older authorizations or coverage policies that reference 19272.

21603 carries a 90-day global period. All routine post-operative management, dressing changes, and related follow-up visits are bundled through day 90. Use modifier 24 for unrelated E/M visits and modifier 78 for an unplanned return to the OR for a complication related to the original procedure during the global window.

RVU & reimbursement

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

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU	24.54
Practice expense RVU	19.34
Malpractice RVU	6.18
Total RVU	50.06
Medicare national rate	$1,672.05
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	$1,672.05
HOPD (APC 5114) Hospital outpatient department	$7,413.38
ASC (PI J8) Ambulatory surgical center (freestanding)	$4,682.29

Common denial reasons

The recurring reasons claims for CPT 21603 get rejected.

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

Billing 21603 when mediastinal lymphadenectomy is not documented — defaults payer review to 21602.
Missing reconstruction documentation; payers downcode to 21601 when flap or prosthetic repair isn't described.
Prior authorization tied to deleted codes 19271/19272 not updated to 21603 after 2020 resequencing.
Unbundling mediastinal lymphadenectomy as a separate line item alongside 21603 — the node dissection is included.
Global period violations: billing routine post-op E/M visits within 90 days without modifier 24.

Frequently asked questions

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

01What separates 21603 from 21602?

Mediastinal lymphadenectomy. 21602 includes rib resection and chest wall reconstruction without nodal dissection. Add the mediastinal lymph node removal and you're at 21603. If the note doesn't document the lymphadenectomy, bill 21602.

02Can I separately bill the mediastinal lymphadenectomy alongside 21603?

No. The mediastinal lymphadenectomy is integral to 21603. Billing it as a separate line item will trigger bundling edits and denial. The node dissection is already reflected in the higher work value of 21603 versus 21602.

03Why did these codes move from the 19000s to the 21000s?

In 2020, AMA deleted 19260, 19271, and 19272 when the associated mastectomy codes were revised. The chest wall tumor excision work was renumbered 21601–21603 and relocated to the Musculoskeletal System, Neck and Thorax subsection. Clinical intent and procedure content didn't change — only the code numbers and section.

04Is 21603 appropriate when a mastectomy is performed at the same session?

Yes, if the chest wall tumor resection with rib involvement and mediastinal lymphadenectomy is performed as a distinct procedure separate from the mastectomy, both can be billed. Document each procedure independently with clear operative indications. Modifier 51 may apply depending on payer rules.

05What does the 90-day global period cover for 21603?

All routine post-operative care from the day of surgery through day 90, including office visits, dressing changes, suture removal, and management of expected post-op issues. Unrelated E/M visits need modifier 24. A return to the OR for a related complication needs modifier 78. An unrelated surgical procedure in the global window needs modifier 79.

06When is modifier 22 appropriate for 21603?

Use modifier 22 when the procedure is substantially more complex than typical — for example, unusually extensive nodal dissection, difficult anatomy from prior surgery or radiation, or exceptionally large tumor with multi-level rib involvement. Document the specific factors that increased operative time and complexity. Most payers require a cover letter with supporting 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 specific rib levels resected, reconstruction method used (flap type, mesh, or graft material), and explicit confirmation that mediastinal lymph node dissection was performed including stations sampled. This prevents downcoding to 21602 — the single most common reason 21603 claims are reduced — by ensuring the operative note contains the documentation auditors look for to validate the lymphadenectomy component.

See how Mira captures CPT 21603 documentation