👂 MDC 03 — Ear, Nose, Mouth & Throat (ENT / Otolaryngology)

MDC 03 Scope

MDC 03 covers diseases and disorders of the ear, nose, mouth, throat, and larynx — the full head and neck region excluding the brain, eyes, and spine. Principal diagnosis must fall within ICD-10-CM chapters covering ENT structures (C00-C14, C30-C32, H60-H95, J00-J06, J30-J39, K00-K14, S00-S09 ENT-specific). Oral surgery and maxillofacial procedures frequently appear here as well.

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📌 Specialty Context

MDC 03 contains some of the highest-acuity surgical DRGs outside the cardiovascular system — major head and neck oncology procedures (laryngectomy, radical neck dissection, composite resection) carry relative weights rivaling cardiac surgery. At the same time, it also contains low-complexity medical DRGs (tonsillitis, otitis, sinusitis admissions).

Tracheostomy Exits MDC 03

When an ENT patient requires tracheostomy with mechanical ventilation, the case is pulled into Pre-MDC DRG 003 or 004 before MDC assignment. These carry RW 14-19+. Always verify tracheostomy PCS coding is complete and accurate. See 🔑 Tracheostomy — Pre-MDC Trigger.

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🔢 MDC 03 DRG Table — Surgical

DRG	Description	RW (approx)	Geo Mean LOS
129	Major head & neck procedures w/ CC/MCC	3.85	7.8
130	Major head & neck procedures w/o CC/MCC	2.10	3.5
131	Cranial/facial procedures w/ CC/MCC	3.20	7.0
132	Cranial/facial procedures w/o CC/MCC	1.80	3.2
133	Other ear, nose, mouth & throat OR procedures w/ CC/MCC	2.40	5.5
134	Other ear, nose, mouth & throat OR procedures w/o CC/MCC	1.25	2.8
135	Sinus & mastoid procedures w/ CC/MCC	2.10	5.0
136	Sinus & mastoid procedures w/o CC/MCC	1.05	2.2
137	Mouth procedures w/ CC/MCC	2.20	5.2
138	Mouth procedures w/o CC/MCC	1.05	2.3
139	Salivary gland procedures	1.15	2.5

DRG 129 — The Workhorse of Head & Neck Oncology

DRG 129 captures laryngectomy, radical neck dissection, composite resection, and major pharyngeal procedures with CC/MCC. With a base RW around 3.85 and high LOS, this is the highest-value routine surgical DRG in MDC 03. Comorbidity capture is critical.

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🩺 MDC 03 DRG Table — Medical

DRG	Description	RW (approx)	Geo Mean LOS
140	Peritonsillar abscess	0.85	2.8
141	Facial trauma & deformity	1.05	3.2
142	Ear, nose, mouth & throat malignancy w/ MCC	1.90	6.5
143	Ear, nose, mouth & throat malignancy w/ CC	1.20	4.5
144	Ear, nose, mouth & throat malignancy w/o CC/MCC	0.75	2.8
145	Other ear, nose, mouth & throat diagnoses w/ MCC	1.55	5.5
146	Other ear, nose, mouth & throat diagnoses w/ CC	0.90	3.5
147	Other ear, nose, mouth & throat diagnoses w/o CC/MCC	0.65	2.2

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🔑 Tracheostomy — Pre-MDC Trigger

This is the single most important DRG concept in ENT inpatient coding.

Pre-MDC DRG	Description	RW (approx)	Trigger
003	ECMO or trach w/ MV 96+ hrs w/ principal dx other than face/mouth/neck	19.0+	Trach + MV ≥ 96 hrs
004	Trach w/ MV 96+ hrs w/ principal dx of face/mouth/neck	11.0+	ENT PDx + trach + MV ≥ 96 hrs
011	Trach for face/mouth/neck diagnoses w/ MCC	5.20	ENT PDx + trach, MV < 96 hrs
012	Trach for face/mouth/neck diagnoses w/ CC	3.60
013	Trach for face/mouth/neck diagnoses w/o CC/MCC	2.80

Tracheostomy PCS Codes — Know These

PCS Code	Description	Notes
0B110F4	Bypass trachea to cutaneous, tracheostomy device	Surgical tracheostomy
0B113F4	Bypass trachea to cutaneous, percutaneous	Percutaneous trach (Ciaglia)
0BH17EZ	Insertion of endotracheal airway, trachea, via natural opening	ETT — NOT a tracheostomy
0BH10FZ	Insertion of tracheostomy device, trachea, open	Trach device insertion

ETT ≠ Tracheostomy

Endotracheal tube insertion (0BH17EZ) does NOT qualify as a tracheostomy and does NOT trigger Pre-MDC DRGs. Only a surgical airway (trach) combined with MV ≥ 96 hrs triggers DRG 003/004. Miscoding ETT as a tracheostomy is a compliance risk.

Mechanical Ventilation Hours — How CMS Counts

CMS counts MV hours from intubation/ventilator start to weaning/extubation. The 96-hour threshold is the dividing line between DRG 003/004 and DRG 011/012/013. Document vent start and stop times precisely.

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⚖️ CC/MCC Drivers — MDC 03

MCCs

Code	Description	Scenario
J96.01	Acute resp failure w/ hypoxia	Airway obstruction, post-op respiratory compromise
J95.821	Acute postprocedural resp failure	Post-laryngectomy, post-neck dissection
A41.9	Sepsis, unspecified	Post-op wound infection → sepsis
R65.20	Severe sepsis	Sepsis + organ dysfunction
G93.41	Metabolic encephalopathy	AMS in post-op head/neck patient
N17.9	AKI	Post-op fluid shifts, contrast, nephrotoxic abx
K72.00	Acute hepatic failure	Rare; alcohol-related in H&N oncology patients
E43	Severe protein-calorie malnutrition	Common in H&N cancer patients; pre-op
T78.3XXA	Angioedema, initial encounter	Airway emergency

CCs

Code	Description	Scenario
J38.4	Edema of larynx	Post-op swelling; radiation-related
J38.00	Vocal cord paralysis, unspecified	Post-thyroid, post-neck dissection
J38.01	Paralysis of vocal cords, unilateral	RLN injury documentation
G47.33	OSA	UPPP, tonsil cases; anesthesia risk
F17.210	Nicotine dependence, cigarettes	Near-universal in H&N oncology
E11.65	T2DM with hyperglycemia	Glucose management; wound healing
Z79.01	Long-term anticoagulant use	Surgical bleeding risk
K12.2	Cellulitis & abscess of mouth	Ludwig’s angina, floor of mouth
J01.90	Acute sinusitis	Baseline — query organism for specificity
H66.3X9	Chronic suppurative otitis media	Mastoidectomy cases
C10.9	Malignant neoplasm of oropharynx	Oncology cases w/o surgical procedure
F10.20	Alcohol use disorder, uncomplicated	Common H&N cancer comorbidity — CC
E44.0	Moderate malnutrition	Pre-chemoradiation nutritional status

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🔪 Key ICD-10-PCS Procedures — ENT

Larynx

PCS Code	Description	OR?	DRG
0CTS0ZZ	Resection of larynx, open (total laryngectomy)	Yes	DRG 129/130
0CBS0ZZ	Excision of larynx, open (partial laryngectomy)	Yes	DRG 129/130
0CQS0ZZ	Repair of larynx, open	Yes	DRG 133/134
0CSS0ZZ	Reposition of larynx	Yes	DRG 133/134

Pharynx / Tonsil / Adenoid

PCS Code	Description	OR?	DRG
0CBN0ZZ	Excision of nasopharynx (nasopharyngectomy)	Yes	DRG 129/130
0CTM0ZZ	Resection of pharynx, open	Yes	DRG 129/130
0CBP0ZZ	Excision of oropharynx	Yes	DRG 133/134
0CTT0ZZ	Resection of palatine tonsil, open (tonsillectomy)	Yes	DRG 133/134
0CTN0ZZ	Resection of nasopharynx (adenoidectomy)	Yes	DRG 133/134

Lymph Node / Neck Dissection

PCS Code	Description	OR?	DRG
07T50ZZ	Resection of right neck lymph node chain	Yes	DRG 129/130
07T60ZZ	Resection of left neck lymph node chain	Yes	DRG 129/130
07B50ZZ	Excision of right neck lymph node (selective)	Yes	DRG 129/130
07D50ZZ	Extraction of neck lymph node	Yes	Sentinel node

Sinus / Nasal

PCS Code	Description	OR?	DRG
09TK0ZZ	Resection of nasal turbinate, open	Yes	DRG 135/136
09BK0ZZ	Excision of nasal turbinate	Yes	DRG 135/136
09UQ0KZ	Supplement nasal septum	Yes	Septoplasty
09BQ0ZZ	Excision of nasal septum (SMR)	Yes	DRG 135/136

Ear / Mastoid

PCS Code	Description	OR?	DRG
09B00ZZ	Excision of right external ear (pinnectomy)	Yes	DRG 133/134
09T20ZZ	Resection of right mastoid sinus	Yes	DRG 135/136
0990ZZZ	Drainage of right ear	Yes	DRG 133/134
09HE0MZ	Insertion of bone anchored hearing device	Yes	DRG 133/134

Salivary Glands

PCS Code	Description	OR?	DRG
0CTF0ZZ	Resection of right parotid gland	Yes	DRG 139
0CTJ0ZZ	Resection of right submaxillary gland	Yes	DRG 139
0CBF0ZZ	Excision of parotid gland (partial parotidectomy)	Yes	DRG 139

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🔬 Principal Diagnosis Guide — MDC 03

Clinical Scenario	PDx Code	DRG Pathway
Laryngeal carcinoma, total laryngectomy	C32.0 (glottis) or C32.1 (supraglottis)	DRG 129/130
Squamous cell carcinoma of tonsil, resection	C09.9	DRG 129/130
Radical neck dissection for metastatic nodes	C77.0 (secondary) — check PDx	DRG 129/130
Parotid gland tumor, parotidectomy	D11.0 (benign) or C07 (malignant)	DRG 139 or 129
Peritonsillar abscess, I&D	J36	DRG 140
Chronic sinusitis, FESS	J32.9 or specific sinus	DRG 135/136
OSA, UPPP	G47.33	DRG 133/134
Acute epiglottitis with airway compromise	J05.10	DRG 145 or Pre-MDC if trach
Epistaxis requiring cautery/packing	R04.0	DRG 133/134 if OR
Mastoiditis with mastoidectomy	H70.009	DRG 135/136
Nasal fracture, ORIF	S02.2XXA	DRG 131/132

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🧪 Key Sequencing Pitfalls — MDC 03

Pitfall 1: Missing Tracheostomy → Wrong DRG Tier

Scenario: H&N cancer patient with laryngectomy requires tracheostomy + MV 120 hours. ❌ Wrong: Code laryngectomy only → DRG 129 (RW ≈ 3.85) ✅ Correct: Code laryngectomy + 0B110F4 trach + MV hours → DRG 004 (RW ≈ 11.0+)

Pitfall 2: Malnutrition Missed in H&N Oncology

Scenario: Laryngeal cancer patient pre-op, albumin 2.0, BMI 16.8, dietitian note documents “severe malnutrition.” ❌ Wrong: No malnutrition coded ✅ Correct: Query → E43 Severe malnutrition (MCC) — moves DRG 130 → DRG 129

Pitfall 3: “Urosepsis” Pattern — Here: “Neck Infection Without Sepsis Documented”

Scenario: Deep neck space infection, WBC 21k, fever, antibiotics, CT shows Ludwig’s angina. ❌ Wrong: Code K12.2 only — Non-CC ✅ Correct: Query for sepsis → A41.9 + K12.2 (source) → MCC DRG tier

Pitfall 4: RLN Injury Not Coded After Neck Dissection

Scenario: Post-thyroidectomy, patient has new unilateral vocal cord paralysis documented by ENT on day 2. ✅ Correct: Code J38.01 Paralysis of vocal cords, unilateral (CC) + J95.89 Other post-procedural complication — POA = N (developed during stay); not a HAC, qualifies as CC.

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📋 Coding Scenarios

Scenario 1: Total Laryngectomy for Laryngeal SCC

Admit: 64M, T3 squamous cell carcinoma of glottis. Total laryngectomy + bilateral neck dissection. Comorbidities: Active smoker F17.210, T2DM E11.65, severe malnutrition pre-op E43, CKD 3b N18.32.

Code	Type	Notes
C32.0	PDx	SCC of glottis
E43	SDx	Severe malnutrition — MCC
F17.210	SDx	Nicotine dependence — CC
E11.65	SDx	T2DM w/ hyperglycemia — CC
N18.32	SDx	CKD 3b — CC
0CTS0ZZ	Proc	Total laryngectomy, open
07T50ZZ	Proc	Bilateral neck dissection

DRG: 129 — Major H&N procedures w/ CC/MCC (MCC present via E43) CDI Opportunity: If post-op AKI documented → remains at DRG 129 w/ MCC, no change needed; additional MCC does not increase DRG further but is still correct to code.

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Scenario 2: Peritonsillar Abscess with Sepsis

Admit: 28F, peritonsillar abscess, I&D performed. WBC 24k, temp 39.3°C, tachycardia. BCx negative. Clinician documents sepsis.

Code	Type	Notes
A41.9	PDx	Sepsis — documented; source is peritonsillar
J36	SDx	Peritonsillar abscess — infection source
0CBC3ZZ	Proc	Drainage of soft palate, percutaneous (I&D)

DRG: Moves to sepsis DRG (MDC 18), not MDC 03 — PDx of sepsis pulls to MDC 18/DRG 871/872.

Sepsis PDx Exits MDC 03

When sepsis is the principal diagnosis, the case routes to MDC 18 regardless of the ENT source. The ENT diagnosis becomes a secondary. Code the ENT source as the underlying infection site.

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🩺 CDI Opportunities — MDC 03

Clinical Finding	Query Target	Impact
Pre-op low albumin/BMI in H&N oncology	Malnutrition E43/E44.0	MCC/CC
Fever + WBC + neck infection source	Sepsis A41.9	MCC; may shift to MDC 18
Post-op oxygen requirement escalation	Resp failure J96.01	MCC
Vocal cord paralysis after neck procedure	RLN injury J38.01	CC; postprocedural
Creatinine rise with nephrotoxic abx	AKI N17.9	MCC
Tracheostomy + prolonged vent	MV hour count → Pre-MDC trigger	RW shift from 3.85 → 11+

See CDI Query Templates for compliant query language.

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🔗 Related Notes

• MS-DRG_Overview
• CC-MCC Reference
• CDI Query Templates
• MDC 02 - Eye
• MDC 11 - Urology
• POA_Indicator_Guide