ICD-10 Code M79.3: Panniculitis, unspecified – [year] guide
ICD-10 Code M79.3 is the billable code for panniculitis, unspecified – inflammation of the subcutaneous fat layer with no documented cause or anatomical site. It’s the code coders default to when the clinical note doesn’t point to a more specific diagnosis, such as lupus panniculitis (L93.2) or neck and back panniculitis (M54.0-). Miscoding into one […]
ICD-10 Code R64: cachexia diagnosis and coding guide
ICD-10 Code R64 (Cachexia) is a billable ICD-10-CM code for a disease-driven wasting syndrome with no named underlying condition. It’s easy to confuse with simple weight loss, malnutrition, or the newer E88.A code for cachexia tied to a specific condition. This guide covers what R64 documents, when to use it instead of E88.A or R63.4, […]
ICD-10 code H90.8: mixed hearing loss guide
ICD-10 Code H90.8 is a billable ICD-10-CM code for mixed conductive and sensorineural hearing loss, unspecified. It applies when the chart confirms both a conductive and a sensorineural component but doesn’t document which ear is affected. H90.8 gets used more often than it should. Audiograms almost always report laterality, so a more specific code, H90.6 […]
ICD-10 Code G55: Nerve root and plexus compressions guide
What is ICD-10 Code G55? ICD-10 Code G55 identifies nerve root and plexus compressions that occur as a manifestation of a disease classified elsewhere in the ICD-10-CM system. It is a billable, specific code valid for HIPAA-covered electronic transactions, meaning it can be submitted directly for reimbursement. The 2026 edition of ICD-10 Code G55 became […]
ICD-10 Code F99: Mental disorder, not otherwise specified
ICD-10 Code F99: Definition and billable status ICD-10 Code F99 represents “Mental disorder, not otherwise specified.” It is a billable/specific ICD-10-CM code valid for reimbursement submission. The 2026 edition became effective on October 1, 2025, per the annual ICD-10-CM update issued by CMS and the CDC’s National Center for Health Statistics (NCHS). F99 sits at […]
ICD-10 Code F69: Adult Personality Disorder Guide
Most personality disorder diagnoses resolve to a specific ICD-10-CM code. F69 exists for the cases that don’t. When clinical documentation confirms a disorder of adult personality and behavior but the evidence doesn’t support a more precise classification, this billable code keeps the claim moving without forcing a diagnosis the record can’t support. That said, F69 […]
ICD-10 Code F09: Unspecified mental disorder guide
ICD-10 Code F09 is a billable ICD-10-CM code for unspecified mental disorder due to a known physiological condition. It sits at the end of the organic mental disorder block, reserved for cases where a physiological cause is confirmed but the presentation doesn’t fit any more specific code from F01 through F06. This guide covers F09’s […]
ICD-10 code K12.2: Cellulitis and abscess of mouth
A cellulitis or abscess on the floor of the mouth can escalate from a swollen, painful jaw to a life-threatening airway emergency within hours. How that infection is documented and coded shapes everything that follows, from the claim to the clinical record. That’s where ICD-10 code K12.2 comes in, the ICD-10-CM diagnosis for cellulitis and […]
ICD-10 Code M65.4: Radial styloid tenosynovitis (de Quervain’s)
Wrist pain on the thumb side is one of the most common musculoskeletal complaints seen in hand surgery, orthopaedic, physical therapy, and primary care settings. Yet de Quervain’s tenosynovitis is also one of the most frequently miscoded conditions. Miscoding happens mostly when laterality is left unspecified or when clinical documentation doesn’t explicitly support the diagnosis. […]
ICD-10 code J36: Peritonsillar abscess coding guide
ICD-10 code J36: Definition and billable status A patient walks in with a one-sided sore throat, a muffled voice, and a jaw too tight to open all the way. That’s peritonsillar abscess, and on the claim, it’s ICD-10 code J36. J36 is easy to confuse with acute tonsillitis (J03.-), since the two look alike on […]