Incision and drainage of a deep abscess or hematoma in the soft tissues of the neck or thorax, with partial rib resection performed during the same operative session.

Verified May 8, 2026 · 6 sources ↓

Medicare: $511.70
Work RVU: 7.36
Global, days: 90
Region: Other

Drawn from CMSAAPCBedrockbillingCodingaheadMdclarity

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 confirm the abscess or hematoma was located in the deep soft tissues of the neck or thorax — not superficial or subcutaneous.
Document that partial rib resection was performed; without explicit mention of bone removal, the note supports 21501 rather than 21502.
Specify the anatomical location (e.g., posterior neck, chest wall, costochondral region) and laterality.
Record the extent of drainage, volume of material evacuated, and whether cultures were obtained.
Include imaging or clinical findings that confirmed the deep-space collection and necessitated operative intervention.
If a drain or packing was placed post-drainage, document placement and type — relevant for post-op management within the global period.

Applicable modifiers

Modifiers commonly billed with this code.

Source · AMA CPT modifier descriptors · CMS NCCI Policy Manual

22 Increased complexity 51 Multiple procedures 52 Reduced services 59 Distinct service 76 Repeat, same physician 77 Repeat, another physician 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 ↓

CPT 21502 describes an I&D of a deep-seated abscess or hematoma in the neck or chest wall soft tissues where the surgeon also removes a portion of rib to gain adequate access or facilitate drainage. The rib resection is what separates this code from 21501 — if no bone work is performed, 21501 is the correct choice. Both codes live in the neck and thorax soft-tissue incision section of the CPT manual.

This is a 90-day global procedure. All routine post-op visits, wound checks, and dressing changes through day 90 are bundled. Anything unrelated billed within that window needs modifier 24 (E/M) or modifier 79 (unrelated surgery). An unplanned return to the OR for a related complication — say, reaccumulation requiring re-drainage — goes with modifier 78, not 79.

Not a common elective case, so payer-specific prior authorization rules vary widely. Some commercial payers require documentation of failed conservative management or imaging confirmation of a deep-space collection before approving the procedure. Verify coverage policy before scheduling when non-emergent.

RVU & reimbursement

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

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU vs. total RVU

The work RVU (7.36) is the surgeon's own effort — the figure physician pay and productivity targets are built on. The total RVU (15.32) adds practice overhead and malpractice, and is what drives the Medicare payment below.

Work RVU	7.36
Practice expense RVU	6.11
Malpractice RVU	1.85
Total RVU	15.32
Medicare national rate	$511.70
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	$511.70
HOPD (APC 5113) Hospital outpatient department	$3,342.87
ASC (PI A2) Ambulatory surgical center (freestanding)	$1,644.87

Common denial reasons

The recurring reasons claims for CPT 21502 get rejected.

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

Upcoding flag: billing 21502 when the operative note lacks any mention of rib resection — downcode to 21501 results.
Missing depth documentation: notes that don't clearly distinguish deep soft tissue from superficial layers trigger medical necessity denials.
Global period conflict: post-op E/M or repeat drainage billed without modifier 24, 78, or 79 during the 90-day global window.
Insufficient medical necessity support: no imaging or clinical documentation confirming a deep-space abscess or hematoma prior to surgical intervention.
Bundling edit triggered when separately billing a procedure that is Column 2 to 21502 without an appropriate NCCI-associated modifier.

Frequently asked questions

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

01What is the difference between CPT 21501 and 21502?

21501 covers I&D of a deep abscess or hematoma in the neck or thorax soft tissues without bone work. 21502 adds partial rib resection to that same procedure. If the operative note doesn't document rib removal, bill 21501.

02Can I bill a separate E/M visit on the same day as 21502?

Only if the E/M is for a significant, separately identifiable reason unrelated to the I&D decision. Append modifier 25 to the E/M. If it's the decision-making visit for the surgery itself, modifier 57 applies when the procedure carries a 90-day global.

03The patient returned to the OR two weeks later for re-drainage of a reaccumulated hematoma — which modifier do I use?

Modifier 78. That is an unplanned return to the OR for a complication related to the original procedure during the 90-day global period. Modifier 79 is for an unrelated procedure — do not use it here.

04Is prior authorization typically required for 21502?

It varies by payer and urgency. Emergency cases generally bypass PA requirements. For elective or semi-urgent cases, commercial payers commonly require imaging confirmation of a deep-space collection and documentation of the clinical necessity for rib resection. Check the specific payer policy before scheduling.

05What ICD-10 diagnoses are commonly paired with 21502?

Deep-space abscess codes (e.g., L02.11x for neck, L02.211 or similar for chest wall), hematoma of chest wall, and post-procedural hematoma codes are the most common. The diagnosis must reflect a deep-tissue process, not a superficial or skin-level abscess, to support the procedure level billed.

06Are routine post-op wound checks billable during the 90-day global?

No. Routine follow-up related to the I&D — including wound checks, dressing changes, and drain management — is bundled into the global period through day 90. Bill separately only for services unrelated to the original procedure, using modifier 24 for E/M or modifier 79 for surgery.

Sources & references

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

Mira Scribe

Mira's AI scribe captures the depth of the collection (deep soft tissue vs. superficial), the anatomical site within the neck or thorax, confirmation that rib resection was performed, volume and character of material drained, and whether a drain or packing was left in place. That specificity prevents the single most common denial for this code: a note that documents drainage but never mentions the rib work, causing a downcode to 21501 on audit.

See how Mira captures CPT 21502 documentation