C05.9

Clinical notes

Documentation support

General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.

• •This code describes an unspecified presentation. If the medical record documents a more specific detail (e.g. laterality, type, or affected site), a more specific sibling code should be used instead — see Related codes below.
• •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.

ICD-9-CM equivalent

Informational only — GEM mappings are approximate, not guaranteed one-to-one equivalents. Verify before use in billing.

• 1455Approximate match

Associated MS-DRGs

C05.9 can serve as the principal diagnosis for these Medicare Severity Diagnosis-Related Groups.

Informational only — actual DRG assignment also depends on procedures, complications/comorbidities (CC/MCC), discharge status, and payer-specific rules not reflected here.

• DRG 011Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy with MCC
• DRG 012Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy with CC
• DRG 013Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy without CC/MCC
• DRG 146Ear, Nose, Mouth and Throat Malignancy with MCC
• DRG 147Ear, Nose, Mouth and Throat Malignancy with CC
• DRG 148Ear, Nose, Mouth and Throat Malignancy without CC/MCC