ICD-10 Code M66.0: Rupture of popliteal cyst
ICD-10 Code M66.0: Definition, billable status, and 2026 edition details ICD-10 code M66.0 is a billable, specific ICD-10-CM code designating rupture of popliteal cyst, more commonly known as a ruptured Baker’s cyst. The 2026 edition became effective October 1, 2025, with no structural changes to the code definition from prior years, and it does not […]
ICD-10 code I51.5: Myocardial degeneration billing guide
ICD-10 code I51.5 is a billable, specific ICD-10-CM code for myocardial degeneration: degenerative changes in the heart muscle wall that are distinct from cardiomyopathy, heart failure, and ischemic disease. Getting the right code depends on knowing exactly what the I51 block covers and where its Excludes1 note redirects you, since several adjacent codes describe similar-sounding […]
ICD-10 code I35.1: Nonrheumatic aortic (valve) insufficiency
ICD-10 Code I35.1 is the billable, specific ICD-10-CM diagnosis code for Nonrheumatic aortic (valve) insufficiency. It remains billable in the FY2026 ICD-10-CM code set maintained by CMS, effective October 1, 2025 through September 30, 2026. ICD-10 Code I35.1: Definition and billability The code has been part of ICD-10-CM since the original US implementation on October […]
ICD-10 Code Y76.8: Miscellaneous obstetric and gynecological devices
ICD-10 Code Y76.8: Miscellaneous obstetric and gynecological devices associated with adverse incidents, not elsewhere classified is the billable external cause code for OB/GYN device malfunctions, breakage, leaks, or failures that don’t fit the more specific Y76.0 through Y76.3 subcodes. Getting this right matters for reimbursement, patient safety reporting, and audit readiness. This reference covers the […]
ICD-10 code T87.42: Infection of amputation stump, left upper extremity
ICD-10 code T87.42 is the billable, specific code for infection of amputation stump, left upper extremity, effective October 1, 2025 under the FY2026 edition of ICD-10-CM. The parent code T87.4 is non-billable, so a claim submitted without a specific child code gets rejected and sits in a denial queue. This reference covers the code’s billable […]
ICD-10 Code C04.9: Malignant neoplasm of floor of mouth, unspecified
ICD-10 Code C04.9 is the billable diagnosis code for malignant neoplasm of floor of mouth, unspecified. It applies when documentation confirms a malignancy in the floor of the mouth but does not specify whether the lesion sits in the anterior or lateral portion. This guide covers where C04.9 sits in the C04 hierarchy, the site-specific […]
ICD-10 Code C13.0: Malignant neoplasm of postcricoid region
ICD-10 Code C13.0 is a billable, four-character ICD-10-CM diagnosis code for malignant neoplasm of postcricoid region, a subsite of the hypopharynx located posterior to the cricoid cartilage. It falls within the C00-C96 neoplasm chapter of the International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM). Hypopharyngeal cancers account for roughly 3-5% of head and neck […]
ICD-10 code C33: Malignant neoplasm of trachea
ICD-10 code C33 is the billable ICD-10-CM code for malignant neoplasm of the trachea, a rare cancer that begins in the windpipe itself rather than the bronchi or lungs. Correctly assigning it depends on documenting exactly where the tumor sits relative to the carina, the anatomical line that separates C33 from the neighboring C34 code. […]
ICD-10 Code H47.9: Unspecified disorder of visual pathways
ICD-10 Code H47.9 is a billable ICD-10-CM code for an unspecified disorder of visual pathways. Coders assign it when documentation doesn’t identify a more specific type, such as optic atrophy, papilledema, a chiasm disorder, or another named condition under H47. It’s also the code payers’ audit systems flag most often, since unspecified codes carry a […]
ICD-10 Code M16.0: Bilateral primary osteoarthritis of hip
ICD-10 Code M16.0: Definition and Clinical Description ICD-10 Code M16.0 is the official ICD-10-CM code for bilateral primary osteoarthritis of hip. It’s a billable, specific code valid for the FY2026 edition, effective October 1, 2025. Per the CMS ICD-10 codes page, M16.0 sits within Chapter XIII of ICD-10-CM (Diseases of the Musculoskeletal System and Connective […]