Crystal's Coder Hub🩻CPT Code 42844 — Radical Resection of Tonsil, Tonsillar Pillars, and/or Retromolar Trigone; Closure with Local Flap
Quick Reference
wRVU: 15.16 · Global: 090 · Assistant: ✅ Payable · Bilateral: ❌ N/A
📋 Full Code Descriptor
CPT 42844 — Radical resection of tonsil, tonsillar pillars, and/or retromolar trigone; closure with local flap (e.g., tongue, buccal)
This procedure represents one of the most extensive ablative interventions in oropharyngeal surgery. It involves the en bloc removal of the tonsil and potentially the anterior and/or posterior tonsillar pillars (palatoglossal and palatopharyngeal arches) and/or the retromolar trigone — the triangular mucosal region posterior to the last mandibular molar. Critically, this code specifies that the resultant surgical defect is closed using a local tissue flap, such as a tongue flap or a buccal (cheek) mucosal flap, rather than being left open or reconstructed with a distant or free flap.
Note
The “radical” designation distinguishes this procedure from simple tonsillectomy. It implies broader oncologic margins, potential involvement of adjacent structures, and a reconstructive component requiring flap design and inset.
🏗️ Anatomical Context
| Structure | Description |
|---|---|
| Tonsil (palatine) | Lymphoid tissue within the tonsillar fossa, bounded by the anterior (palatoglossal) and posterior (palatopharyngeal) pillars |
| Tonsillar pillars | Mucosal folds flanking the tonsil; the anterior pillar forms part of the soft palate; the posterior pillar is the palatopharyngeal arch |
| Retromolar trigone | Triangular mucosa overlying the ascending ramus of the mandible, directly posterior to the last lower molar; a frequent site of squamous cell carcinoma spread |
| Local flap options | Tongue flap (anterior or posterior based), buccal mucosal advancement flap, palatal rotation flap |
💰 Valuation & Reimbursement
| Field | Value |
|---|---|
| wRVU | 15.16 ^[CMS Physician Fee Schedule 2025] |
| Global Period | 090 days |
| Assistant Surgeon Payable | ✅ Yes — Modifier -80, -82, or -AS applicable |
| Bilateral Procedure | ❌ Not applicable by nature |
| Team Surgery (Co-Surgeons) | Potentially applicable — see Modifier -62 |
| OPPS Status | Facility APC may apply in outpatient setting (rare for this procedure) |
Modifier -22 Tip
If the resection is significantly more extensive than typical — e.g., involvement of the soft palate, base of tongue, or mandibular periosteum requiring additional dissection time and complexity — Modifier -22 (Increased Procedural Services) may be appended with supporting documentation of the increased work.
🌲 Code Tree / Code Family
This code is part of a three-code family for radical oropharyngeal resection, distinguished solely by the method of defect closure:
42842 — Radical resection of tonsil, tonsillar pillars, and/or retromolar trigone; WITHOUT closure
└── Defect left to granulate or intentionally left open
42844 — ...closure with LOCAL FLAP (e.g., tongue, buccal) ← THIS CODE
└── Adjacent tissue rotated or advanced to close the defect
42845 — ...closure with OTHER FLAP
└── Regional (pedicled) flap or free tissue transfer (e.g., radial forearm, pectoralis major)
Related codes in the same subsection:
| Code | Descriptor |
|---|---|
| 42800 | Biopsy; oropharynx |
| 42804 | Biopsy; nasopharynx, visible lesion, simple |
| 42808 | Excision or destruction of lesion of pharynx, any method |
| 42810 | Excision branchial cleft cyst/vestige, confined to skin & subcutaneous tissues |
| 42815 | Excision branchial cleft cyst/vestige/fistula extending beneath subcutaneous tissues and/or into pharynx |
| 42820 | Tonsillectomy and adenoidectomy; younger than age 12 |
| 42821 | Tonsillectomy and adenoidectomy; age 12 or over |
| 42842 | Radical resection — without closure |
| 42844 | Radical resection — closure with local flap |
| 42845 | Radical resection — closure with other flap |
✅ Includes (Bundled Into 42844)
The following are inherent components of the procedure and are not separately reportable:
- Incision and exposure of the oropharyngeal field
- Radical dissection and en bloc removal of the tonsil ± tonsillar pillars ± retromolar trigone tissue
- Hemostasis (electrocautery, suture ligation)
- Design, elevation, and inset of the local flap (tongue or buccal)
- Wound irrigation and layered closure of donor/flap site
- Routine intraoperative endoscopy or visualization of the oropharynx as part of access
❌ Excludes / Separately Reportable
Do NOT bundle the following — report separately when documented and medically necessary
| Code | Descriptor | Notes |
|---|---|---|
| 31600 / 31601 | Tracheostomy, planned (adult / under 2 years) | Airway management commonly performed concurrently for access or airway protection; separately reportable |
| 38700 / 38720 / 38724 | Cervical lymphadenectomy / radical neck dissection / modified radical neck dissection | Neck dissection is a distinct, separately reportable procedure |
| 21045 | Radical resection of mandible | If bony mandibular resection is required |
| 21025 | Excision of bone (mandible) | Marginal mandibulectomy, if applicable |
| 43030 | Cricopharyngeal myotomy | If performed at same session for dysphagia |
| 15732 / 15734 | Muscle flap (head/neck region) | If a pectoralis or other muscle flap is used instead (note: would reclassify to 42845) |
| 31535 / 31536 | Laryngoscopy with biopsy | Separate diagnostic or staging procedure |
| Anesthesia | Reported separately by the anesthesia team |
🏥 MS-DRG Mapping
Inpatient Grouping
When 42844 is performed in an inpatient setting, MS-DRG assignment depends heavily on the principal diagnosis, CCs/MCCs, and whether a tracheostomy was performed.
Without Concurrent Tracheostomy (Most Common Scenario)
| MS-DRG | Title | Trigger |
|---|---|---|
| 168 | Mouth Procedures with MCC | Malignancy + major complication/comorbidity |
| 169 | Mouth Procedures with CC | Malignancy + complication/comorbidity |
| 170 | Mouth Procedures without CC/MCC | No significant comorbidity |
With Concurrent Tracheostomy (High Complexity Cases)
| MS-DRG | Title | Notes |
|---|---|---|
| 011 | Tracheostomy for Face, Mouth & Neck Diagnoses or Laryngectomy with MCC | Highest-weighted DRG in MDC 03 |
| 012 | Tracheostomy for Face, Mouth & Neck Diagnoses or Laryngectomy with CC | |
| 013 | Tracheostomy for Face, Mouth & Neck Diagnoses or Laryngectomy without CC/MCC |
Coder's Note — MDC 03
MDC 03 (Ear, Nose, Mouth, and Throat Diseases and Disorders) governs this DRG assignment. The OR procedure of radical tonsil resection with local flap closure is the operative trigger. Ensure the principal diagnosis is coded to a pharyngeal/tonsillar malignancy for accurate DRG grouping.
🔬 Commonly Associated ICD-10-CM Diagnoses
Primary Indications (Malignant)
| ICD-10-CM | Descriptor | HCC Mapping | Notes |
|---|---|---|---|
| C09.0 | Malignant neoplasm of tonsillar fossa | HCC 10 (v24) / HCC 17 (v28) | Most specific for fossa involvement |
| C09.1 | Malignant neoplasm of tonsillar pillar (anterior/posterior) | HCC 10 (v24) / HCC 17 (v28) | Pillar involvement; maps to radical extent |
| C09.9 | Malignant neoplasm of tonsil, unspecified | HCC 10 (v24) / HCC 17 (v28) | Use when laterality/subsite not documented |
| C09.80 | Malignant neoplasm of overlapping sites of tonsil | HCC 10 (v24) / HCC 17 (v28) | Multi-subsite tonsil involvement |
| C06.2 | Malignant neoplasm of retromolar area | HCC 10 (v24) / HCC 17 (v28) | Principal Dx when retromolar trigone is primary site |
| C10.0 | Malignant neoplasm of vallecula | HCC 10 (v24) / HCC 17 (v28) | If resection extends to vallecula |
| C10.2 | Malignant neoplasm of lateral wall of oropharynx | HCC 10 (v24) / HCC 17 (v28) | Lateral oropharynx |
| C10.9 | Malignant neoplasm of oropharynx, unspecified | HCC 10 (v24) / HCC 17 (v28) | Broad oropharyngeal primary |
Secondary / Complication / Comorbidity Codes
| ICD-10-CM | Descriptor | HCC | Notes |
|---|---|---|---|
| Z85.819 | Personal history of malignant neoplasm of unspecified site of lip, oral cavity, pharynx | Non-HCC | History codes — post-resection follow-up |
| Z79.01 | Long-term use of anticoagulants | Non-HCC | Complicates hemostasis; CC potential |
| E11.9 | Type 2 diabetes mellitus without complications | HCC 37 (v24) | MCC/CC modifier for wound healing risk |
| K92.1 | Melena | Non-HCC | Post-op pharyngeal bleed |
| J69.0 | Pneumonitis due to inhalation of food and vomit | HCC 114 (v24) | Aspiration risk — major postop complication |
| B20 | Human immunodeficiency virus (HIV) disease | HCC 1 (v24) | Immunocompromised patient — MCC |
HCC Note
HCC mappings shown reflect CMS-HCC Model v24 (Medicare Advantage risk adjustment) and v28 where noted. Tonsil/oropharynx malignancies (C09.x, C10.x, C06.2) uniformly map to cancer HCC categories and carry significant RAF score weight. Always confirm mapping against the current CMS crosswalk for the applicable payment year. ^[CMS HCC Model v24/v28 Crosswalk, CMS.gov] ^[ICD-10-CM Official Guidelines for Coding and Reporting, FY2025]
🔧 Applicable Modifiers
| Modifier | Name | When to Use with 42844 |
|---|---|---|
| -22 | Increased Procedural Services | Extensive disease, prolonged operative time, unusually complex anatomy; requires documentation |
| -50 | Bilateral Procedure | Rarely applicable — bilateral radical tonsil resection would be extraordinary; document carefully |
| -51 | Multiple Procedures | When 42844 is performed with other distinct procedures at the same operative session (e.g., neck dissection) |
| -52 | Reduced Services | Planned procedure not fully completed due to patient tolerance or pathology findings |
| -59 | Distinct Procedural Service | Separate anatomic site or distinct procedure; use when there is risk of bundling |
| -62 | Two Surgeons | When an ENT surgeon and oral/maxillofacial surgeon co-operate as primary surgeons, each performing distinct portions; both report 42844--62 |
| -66 | Surgical Team | Complex cases requiring a surgical team (rare for this code) |
| -80 | Assistant Surgeon | Physician assistant at surgery |
| -82 | Assistant Surgeon (when qualified resident not available) | Teaching hospital context |
| -AS | Assistant at Surgery (PA, NP, CNS) | Mid-level practitioner assisting; must be documented and payer-specific |
📖 Operative Note Key Elements (Documentation Requirements)
For accurate coding and audit defense, the operative note should explicitly document:
- Diagnosis driving the procedure — e.g., squamous cell carcinoma of the right tonsil with extension to the anterior tonsillar pillar
- Extent of resection — which structures were removed (tonsil only vs. pillar involvement vs. retromolar trigone)
- Margins — whether oncologic margins were achieved (influences additional coding if re-excision)
- Type of flap — specifically named (e.g., “tongue flap,” “buccal mucosal advancement flap”) — this is what distinguishes 42844 from 42842 or 42845
- Flap design and inset — pedicle, dimensions, and rotation/advancement arc
- Concurrent procedures — tracheostomy, neck dissection; must be independently documented
🧪 Coding Examples
Example 1 — Squamous Cell Carcinoma, Right Tonsil with Tongue Flap
A 62-year-old male with T2N0 squamous cell carcinoma of the right tonsillar fossa undergoes radical resection of the right tonsil and anterior tonsillar pillar with closure via a posterior tongue flap. A concurrent right selective neck dissection (levels II-IV) is performed.
CPT Codes:
- 42844 — Radical resection of tonsil/tonsillar pillars; closure with local flap (tongue)
- 38542 — Excision, deep cervical node(s), with or without biopsy (or appropriate neck dissection code per dissection type)
- Consider 38720 or 38724 for modified radical neck dissection if applicable
ICD-10-CM Codes:
- C09.0 — Malignant neoplasm of tonsillar fossa (principal diagnosis)
- C77.0 — Secondary malignant neoplasm of lymph nodes of head, face and neck (if nodal involvement confirmed)
Example 2 — Retromolar Trigone Carcinoma, Buccal Flap, with Tracheostomy
A 57-year-old female with squamous cell carcinoma of the right retromolar trigone and posterior tonsil undergoes radical resection with buccal mucosal flap closure. Tracheostomy performed for airway protection.
CPT Codes:
- 42844 — Radical resection; closure with local (buccal) flap
- 31600 — Tracheostomy, planned (separate, distinct procedure)
ICD-10-CM Codes:
- C06.2 — Malignant neoplasm of retromolar area (principal)
- C09.9 — Malignant neoplasm of tonsil, unspecified (secondary site)
Expected MS-DRG:
- MS-DRG 011 (Tracheostomy for Face, Mouth & Neck Diagnoses with MCC) — if MCC present
- MS-DRG 012 or 013 — based on CC/MCC status
Example 3 — Recurrent Tonsil Carcinoma, No CC/MCC
Patient with recurrent T1 right tonsillar carcinoma following prior radiation. Surgeon performs radical resection of the right tonsil with anterior pillar; closure achieved with local tongue advancement flap. No neck dissection. No concurrent tracheostomy. No significant comorbidities.
CPT: 42844 ICD-10-CM: C09.9 (recurrent; query surgeon for laterality/subsite specificity) MS-DRG: 170 — Mouth Procedures without CC/MCC
⚠️ Coding Pitfalls & Compliance Notes
Common Errors
- Miscoding as 42821 (standard tonsillectomy): A standard tonsillectomy does not involve radical margins, tonsillar pillar removal, or retromolar trigone resection. The pathology driving the surgery, the operative extent, and the reconstructive necessity all distinguish 42844 from simple tonsillectomy.
- Omitting the flap documentation: If the operative report does not clearly identify the local flap used, the coder cannot differentiate 42844 from 42842 (no closure). Query the surgeon.
- Incorrectly bundling neck dissection: Neck dissection is a separately reportable procedure. Do not bundle it into 42844.
- Modifier -51 omission: When multiple surgical procedures are performed, Modifier -51 should be appended to the secondary procedure(s) for non-facility billing. Confirm payer-specific rules.
- HCC capture failure: C09.x and C06.2 carry HCC weight — ensure these are captured on every encounter, not just the surgical admission, for accurate RAF scoring in Medicare Advantage patients.
🔗 Related Notes
- 42842 — Radical resection without closure
- 42845 — Radical resection with other flap
- 38720 — Cervical lymphadenectomy, complete
- 38724 — Cervical lymphadenectomy, modified radical neck dissection
- 31600 — Tracheostomy, planned
- C09.0 — Malignant neoplasm of tonsillar fossa
- C06.2 — Malignant neoplasm of retromolar area
AMA CPT Codebook 2025 · CMS Physician Fee Schedule Final Rule 2025 · CMS MS-DRG ICD-10 Version 42 Definitions Manual · CMS-HCC Risk Adjustment Model v24/v28 · ICD-10-CM Official Guidelines for Coding and Reporting FY2025 · AAPC CPC/CIC Coding Reference