Crystal's MCW Coder Hub🩺CPT Code 42820 - Excision, Peritonsillar Abscess
Official Descriptor
CPT Code 42820: Excision, peritonsillar abscess.
Layman’s Description
This procedure involves the surgical removal or drainage of a collection of pus (abscess) that forms in the tissue around the tonsils (peritonsillar space). It is often performed to relieve pain, difficulty swallowing, and airway obstruction caused by a severe throat infection known as a quinsy. Unlike a simple incision and drainage, this code implies a more definitive excision of the abscess wall or tissue.
Technical Details
| Field | Value |
|---|---|
| CPT Code | 42820 |
| Primary Specialty | Otolaryngology (ENT) |
| Global Period | 0 DaysCMS MPFS 2024 |
| Work RVU (wRVU) | 3.76 (Approximate, varies by year)CMS MPFS 2024 |
| Assistant Surgeon | Yes (Indicator 1)CMS MPFS 2024 |
| Facility Status | Office, Outpatient Hospital, ASC |
| Anesthesia | Local or General |
| Typical Setting | Outpatient |
Code Tree / Hierarchy
- Surgery
- Digestive System
- Palate and Uvula
- Excision
- 42820 (Excision, peritonsillar abscess)
- 42821 (Abscess; pharyngeal, retropharyngeal)
- Excision
- Palate and Uvula
- Digestive System
Includes
- Incision of the peritonsillar space.
- Drainage of pus or fluid.
- Excision of the abscess sac/wall.
- Local control of hemorrhage associated with the procedure.
- Immediate postoperative care.
Excludes
- Tonsillectomy: If a full tonsillectomy is performed during the same session, 42820 may be bundled depending on payer rules, though often they are distinct if the tonsil itself is not removed but only the abscess around it.
- Incision and Drainage (I&D) only: Simple needle aspiration or simple I&D without excision may fall under evaluation and management (E/M) or different procedure codes depending on complexity.
- Treatment of underlying infection: Antibiotic administration is billed separately via drug codes or E/M.
- Complications: Treatment of secondary hemorrhage occurring after the global period (if applicable) or requiring return to OR.
Associated ICD-10-CM Diagnoses
The following diagnosis codes are commonly linked to 42820.
| ICD-10 Code | Description | HCC Risk Adjustment |
|---|---|---|
| J36 | Peritonsillar abscess | NoCMS HCC Model |
| J35.1 | Hypertrophy of tonsils | NoCMS HCC Model |
| J03.90 | Acute tonsillitis, unspecified | NoCMS HCC Model |
| R50.9 | Fever, unspecified | NoCMS HCC Model |
Note on HCC:
Hierarchical Condition Categories (HCC) are used for risk adjustment in Medicare Advantage and ACA plans. Acute conditions like abscesses (J36) generally do not carry HCC risk adjustment values. HCCs are reserved for chronic conditions (e.g., Diabetes, CHF).
MS-DRG Information (Inpatient Context)
While 42820 is predominantly an outpatient procedure, if performed during an inpatient admission:
- MS-DRG: Depends on the principal diagnosis and presence of complications/comorbidities (CC/MCC).
- Potential DRGs:
- DRG 163: Major Head & Neck Procedures with CC/MCC.
- DRG 164: Major Head & Neck Procedures without CC/MCC.
- Medical DRGs: If the procedure is minor relative to the stay, the patient may be grouped under medical respiratory DRGs (e.g., J36 as principal diagnosis).
- Status: Most payers expect this procedure to be performed in an Ambulatory Surgery Center (ASC) or Hospital Outpatient Department (HOPD).
Modifiers
Common modifiers that may be appended to 42820:
- -50: Bilateral Procedure (Rare for abscess, usually unilateral).
- -59: Distinct Procedural Service (If performed with another unrelated procedure).
- -76: Repeat Procedure by Same Physician.
- -77: Repeat Procedure by Another Physician.
- -78: Unplanned Return to the Operating Room.
- -79: Unrelated Procedure or Service by the Same Physician During the Postoperative Period.
- -LT: Left Side.
- -RT: Right Side.
Coding Examples
Example 1: Standard Abscess Excision
Scenario: A patient presents with severe sore throat, trismus, and “hot potato” voice. Exam reveals a bulge in the soft palate on the left side. The patient is taken to the outpatient OR. Under general anesthesia, the mucosa is incised, and the peritonsillar abscess sac is excised and drained.
- CPT: 42820-LT
- ICD-10: J36
- Rationale: The procedure matches the descriptor exactly. Laterality modifier added for specificity.
Example 2: Bilateral Presentation
Scenario: Rarely, abscesses may form bilaterally. The physician excises the abscess on both the left and right sides during the same session.
- CPT: 42820-50
- ICD-10: J36
- Rationale: Modifier -50 indicates the procedure was performed on both sides. Payer rules vary on reimbursement (150% vs 200%).
Example 3: Return to OR for Hemorrhage
Scenario: Patient undergoes 42820 on Day 1. On Day 2, patient returns to the OR due to significant bleeding from the excision site.
- CPT: 42820--78
- ICD-10: K91.840 (Postprocedural hemorrhage of digestive system)
- Rationale: Modifier -78 indicates an unplanned return to the OR by the same physician for a related procedure during the post-op period. (Note: Global period is 0 days, but payer policies on complications vary).
Clinical Pearls & Documentation Requirements
- Documentation: Must clearly state “excision” rather than just “incision and drainage” to support 42820 over simpler codes. Note the location (peritonsillar).
- Anesthesia: Document the type of anesthesia used (Local vs. General).
- Laterality: Always document Left, Right, or Bilateral.
- Complications: Document any complications such as excessive bleeding or injury to surrounding structures.
- Pathology: If tissue is sent to pathology, ensure the pathology report supports the diagnosis of abscess vs. neoplasm.
Related Codes
- 42821: Excision of pharyngeal or retropharyngeal abscess (Deeper neck space).
- 42825: Excision, uvula; simple.
- 42826: Excision, uvula; extensive.
- 42820 vs Needle Aspiration: Needle aspiration is often considered an E/M service or a minor procedure not separately payable depending on the payer, whereas 42820 is a definitive surgical excision.
Sources
CMS MPFS 2024 Centers for Medicare & Medicaid Services, Physician Fee Schedule Final Rule 2024. AMA CPT 2024 American Medical Association, Current Procedural Terminology 2024 Edition. CMS HCC Model Centers for Medicare & Medicaid Services, Risk Adjustment Model Documentation. ICD-10-CM National Center for Health Statistics, ICD-10-CM Official Guidelines for Coding and Reporting.