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  3. Diagnosis Codes in MS-DRG 146 - Ear, Nose, Mouth And Throat Malignancy With MCC

Diagnosis Codes in MS-DRG 146 - Ear, Nose, Mouth And Throat Malignancy With MCC

The Medicare Severity Diagnosis-Related Group (MS-DRG) is a patient classification system used to categorize hospital cases based on clinical similarity and expected resource use. MS-DRGs organize all possible principal diagnoses into mutually exclusive groups known as Major Diagnostic Categories (MDCs), which help determine reimbursement under the Medicare Inpatient Prospective Payment System.

This section lists the diagnosis codes included in MS-DRG V42.0: Ear, Nose, Mouth and Throat Malignancy with MCC from October 1, 2024, through September 30, 2025.

MS-DRG: 146

MS-DRG Title: Ear, Nose, Mouth and Throat Malignancy with MCC

MCD: 03

Relative Weight: 2.2939 Relative Weight
The relative weight of a diagnostic related group determines the reimbursement rate based on the severity of a patient's illness and the associated cost of care during hospitalization.

Geometric LOS: 2.29 Geometric Length of Stay
The geometric mean length of stay (GMLOS) is used by Medicare to calculate the reimbursement for patients whose medical treatment takes a much longer or shorter time than average.

Arithmetic LOS: 5.90 Arithmetic Length of Stay
The average length of stay (ALOS) reflects the average number of days a patient spends in a hospital for each admission.

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    • C01 - Malignant neoplasm of base of tongue

    • C07 - Malignant neoplasm of parotid gland

    • C12 - Malignant neoplasm of pyriform sinus

  • C00 - Malignant neoplasm of lip

    • C00.0 - Malignant neoplasm of external upper lip

    • C00.1 - Malignant neoplasm of external lower lip

    • C00.2 - Malignant neoplasm of external lip, unspecified

    • C00.3 - Malignant neoplasm of upper lip, inner aspect

    • C00.4 - Malignant neoplasm of lower lip, inner aspect

    • C00.5 - Malignant neoplasm of lip, unspecified, inner aspect

    • C00.6 - Malignant neoplasm of commissure of lip, unspecified

    • C00.8 - Malignant neoplasm of overlapping sites of lip

    • C00.9 - Malignant neoplasm of lip, unspecified

  • C02 - Malignant neoplasm of other and unspecified parts of tongue

    • C02.0 - Malignant neoplasm of dorsal surface of tongue

    • C02.1 - Malignant neoplasm of border of tongue

    • C02.2 - Malignant neoplasm of ventral surface of tongue

    • C02.3 - Malignant neoplasm of anterior two-thirds of tongue, part unspecified

    • C02.4 - Malignant neoplasm of lingual tonsil

    • C02.8 - Malignant neoplasm of overlapping sites of tongue

    • C02.9 - Malignant neoplasm of tongue, unspecified

  • C03 - Malignant neoplasm of gum

    • C03.0 - Malignant neoplasm of upper gum

    • C03.1 - Malignant neoplasm of lower gum

    • C03.9 - Malignant neoplasm of gum, unspecified

  • C04 - Malignant neoplasm of floor of mouth

    • C04.0 - Malignant neoplasm of anterior floor of mouth

    • C04.1 - Malignant neoplasm of lateral floor of mouth

    • C04.8 - Malignant neoplasm of overlapping sites of floor of mouth

    • C04.9 - Malignant neoplasm of floor of mouth, unspecified

  • C05 - Malignant neoplasm of palate

    • C05.0 - Malignant neoplasm of hard palate

    • C05.1 - Malignant neoplasm of soft palate

    • C05.2 - Malignant neoplasm of uvula

    • C05.8 - Malignant neoplasm of overlapping sites of palate

    • C05.9 - Malignant neoplasm of palate, unspecified

  • C06 - Malignant neoplasm of other and unspecified parts of mouth

    • C06.0 - Malignant neoplasm of cheek mucosa

    • C06.1 - Malignant neoplasm of vestibule of mouth

    • C06.2 - Malignant neoplasm of retromolar area

    • C06.9 - Malignant neoplasm of mouth, unspecified

  • C06.8 - Malignant neoplasm of overlapping sites of other and unspecified parts of mouth

    • C06.80 - Malignant neoplasm of overlapping sites of unspecified parts of mouth

    • C06.89 - Malignant neoplasm of overlapping sites of other parts of mouth

  • C08 - Malignant neoplasm of other and unspecified major salivary glands

    • C08.0 - Malignant neoplasm of submandibular gland

    • C08.1 - Malignant neoplasm of sublingual gland

    • C08.9 - Malignant neoplasm of major salivary gland, unspecified

  • C09 - Malignant neoplasm of tonsil

    • C09.0 - Malignant neoplasm of tonsillar fossa

    • C09.1 - Malignant neoplasm of tonsillar pillar (anterior) (posterior)

    • C09.8 - Malignant neoplasm of overlapping sites of tonsil

    • C09.9 - Malignant neoplasm of tonsil, unspecified

  • C10 - Malignant neoplasm of oropharynx

    • C10.0 - Malignant neoplasm of vallecula

    • C10.1 - Malignant neoplasm of anterior surface of epiglottis

    • C10.2 - Malignant neoplasm of lateral wall of oropharynx

    • C10.3 - Malignant neoplasm of posterior wall of oropharynx

    • C10.4 - Malignant neoplasm of branchial cleft

    • C10.8 - Malignant neoplasm of overlapping sites of oropharynx

    • C10.9 - Malignant neoplasm of oropharynx, unspecified

  • C11 - Malignant neoplasm of nasopharynx

    • C11.0 - Malignant neoplasm of superior wall of nasopharynx

    • C11.1 - Malignant neoplasm of posterior wall of nasopharynx

    • C11.2 - Malignant neoplasm of lateral wall of nasopharynx

    • C11.3 - Malignant neoplasm of anterior wall of nasopharynx

    • C11.8 - Malignant neoplasm of overlapping sites of nasopharynx

    • C11.9 - Malignant neoplasm of nasopharynx, unspecified

  • C13 - Malignant neoplasm of hypopharynx

    • C13.0 - Malignant neoplasm of postcricoid region

    • C13.1 - Malignant neoplasm of aryepiglottic fold, hypopharyngeal aspect

    • C13.2 - Malignant neoplasm of posterior wall of hypopharynx

    • C13.8 - Malignant neoplasm of overlapping sites of hypopharynx

    • C13.9 - Malignant neoplasm of hypopharynx, unspecified

  • C14 - Malignant neoplasm of other and ill-defined sites in the lip, oral cavity and pharynx

    • C14.0 - Malignant neoplasm of pharynx, unspecified

    • C14.2 - Malignant neoplasm of Waldeyer's ring

    • C14.8 - Malignant neoplasm of overlapping sites of lip, oral cavity and pharynx

  • C30 - Malignant neoplasm of nasal cavity and middle ear

    • C30.0 - Malignant neoplasm of nasal cavity

    • C30.1 - Malignant neoplasm of middle ear

  • C31 - Malignant neoplasm of accessory sinuses

    • C31.0 - Malignant neoplasm of maxillary sinus

    • C31.1 - Malignant neoplasm of ethmoidal sinus

    • C31.2 - Malignant neoplasm of frontal sinus

    • C31.3 - Malignant neoplasm of sphenoid sinus

    • C31.8 - Malignant neoplasm of overlapping sites of accessory sinuses

    • C31.9 - Malignant neoplasm of accessory sinus, unspecified

  • C32 - Malignant neoplasm of larynx

    • C32.0 - Malignant neoplasm of glottis

    • C32.1 - Malignant neoplasm of supraglottis

    • C32.2 - Malignant neoplasm of subglottis

    • C32.3 - Malignant neoplasm of laryngeal cartilage

    • C32.8 - Malignant neoplasm of overlapping sites of larynx

    • C32.9 - Malignant neoplasm of larynx, unspecified

  • C39 - Malignant neoplasm of other and ill-defined sites in the respiratory system and intrathoracic organs

    • C39.0 - Malignant neoplasm of upper respiratory tract, part unspecified

  • C46 - Kaposi's sarcoma

    • C46.2 - Kaposi's sarcoma of palate

  • C76 - Malignant neoplasm of other and ill-defined sites

    • C76.0 - Malignant neoplasm of head, face and neck

  • D00.0 - Carcinoma in situ of lip, oral cavity and pharynx

    • D00.00 - Carcinoma in situ of oral cavity, unspecified site

    • D00.01 - Carcinoma in situ of labial mucosa and vermilion border

    • D00.02 - Carcinoma in situ of buccal mucosa

    • D00.03 - Carcinoma in situ of gingiva and edentulous alveolar ridge

    • D00.04 - Carcinoma in situ of soft palate

    • D00.05 - Carcinoma in situ of hard palate

    • D00.06 - Carcinoma in situ of floor of mouth

    • D00.07 - Carcinoma in situ of tongue

    • D00.08 - Carcinoma in situ of pharynx

  • D02 - Carcinoma in situ of middle ear and respiratory system

    • D02.0 - Carcinoma in situ of larynx

  • D37.0 - Neoplasm of uncertain behavior of lip, oral cavity and pharynx

    • D37.01 - Neoplasm of uncertain behavior of lip

    • D37.02 - Neoplasm of uncertain behavior of tongue

    • D37.04 - Neoplasm of uncertain behavior of the minor salivary glands

    • D37.05 - Neoplasm of uncertain behavior of pharynx

    • D37.09 - Neoplasm of uncertain behavior of other specified sites of the oral cavity

  • D37.03 - Neoplasm of uncertain behavior of the major salivary glands

    • D37.030 - Neoplasm of uncertain behavior of the parotid salivary glands

    • D37.031 - Neoplasm of uncertain behavior of the sublingual salivary glands

    • D37.032 - Neoplasm of uncertain behavior of the submandibular salivary glands

    • D37.039 - Neoplasm of uncertain behavior of the major salivary glands, unspecified

  • D38 - Neoplasm of uncertain behavior of middle ear and respiratory and intrathoracic organs

    • D38.0 - Neoplasm of uncertain behavior of larynx