Clinical Coding Hubs

Medical Specialties Coding Directory: Clinical Billing Guides

Specialty-specific coding rules, top ICD-10 diagnosis codes, procedural CPT/HCPCS crosswalks, documentation traps, and AAPC CPC exam blueprints.

Clinical Hub CY 2026 / FY 2027

Cardiology Coding & Billing Hub

Comprehensive coding guidance for cardiovascular medicine, diagnostic testing, cardiac catheterization, echocardiography, and rhythm management.

Key Diagnoses: I10, I25.10, I50.9, I48.91, I48.0, I49.9, I11.0, I11.9
Key Procedures: G2211, 93000, 93010, 93306, 93458, 93224
CPC Exam Tip: AAPC CPC exam heavily tests combination hypertensive codes, component billing (26/TC) for diagnostic testing, and myocardial infarction sequencing rules.
Open Cardiology Hub →
Clinical Hub CY 2026 / FY 2027

Orthopedics & Sports Medicine Coding Hub

Guidance for surgical and non-surgical musculoskeletal coding, fracture management, joint arthroplasty, and arthroscopy.

Key Diagnoses: M54.50, M17.11, M17.12, S52.521A, S82.101A, M25.561
Key Procedures: 20610, 29881, 27447, 29827, 23412
CPC Exam Tip: High CPC exam emphasis on musculoskeletal CPT range (20005-29999), bilateral knee/hip injections, and Gustilo open fracture classifications.
Open Orthopedics Hub →
Clinical Hub CY 2026 / FY 2027

Dermatology Coding & Billing Hub

Clinical coding rules for benign and malignant lesion destruction, biopsies, excisions, repairs, and Mohs micrographic surgery.

Key Diagnoses: L70.0, L40.0, C44.319, D22.9, L82.1, L57.0
Key Procedures: 11102, 11104, 11402, 11602, 17000, 17311
CPC Exam Tip: CPC exam routinely includes Mohs surgery stage and tissue block calculations, complex flap repairs, and distinguishing tangential vs punch biopsies.
Open Dermatology Hub →
Clinical Hub CY 2026 / FY 2027

Mental & Behavioral Health Coding Hub

Coding guidelines for psychiatric diagnostic evaluations, individual psychotherapy, crisis intervention, and collaborative psychiatric care.

Key Diagnoses: F32.9, F33.1, F41.1, F43.10, F90.9, F10.20
Key Procedures: 90791, 90792, 90832, 90834, 90837, 90833, 90836
CPC Exam Tip: Tests psychotherapy time thresholds (e.g. 90834 requires 38-52 minutes of face-to-face time) and distinguishing 90791 (without medical services) vs 90792 (with medical services).
Open Mental Hub →
Clinical Hub CY 2026 / FY 2027

Primary Care & Family Medicine Coding Hub

Comprehensive outpatient evaluation and management (E/M) coding, preventive medicine wellness checkups, chronic disease management, and transitional care.

Key Diagnoses: I10, E11.9, Z00.00, Z23, R05.9, J06.9, E78.5
Key Procedures: 99213, 99214, 99215, 99395, 99396, G2211, 99490
CPC Exam Tip: The cornerstone of the CPC exam: medical decision making (MDM) table leveling, total encounter time thresholds, and preventive vs problem-oriented visit split billing.
Open Primary Hub →
Clinical Hub CY 2026 / FY 2027

Emergency Medicine Coding Hub

Emergency department evaluation and management leveling (99281-99285), critical care services (99291-99292), and urgent trauma resuscitation.

Key Diagnoses: R07.9, R10.9, R55, S06.0X0A, T79.A0XA, J96.00
Key Procedures: 99283, 99284, 99285, 99291, 99292, 12001, 31500
CPC Exam Tip: Tests identifying high complexity medical decision making for 99285 and time tracking for critical care add-on code 99292.
Open Emergency Hub →
Clinical Hub CY 2026 / FY 2027

Gastroenterology & Endoscopy Coding Hub

Diagnostic and therapeutic endoscopy coding, colonoscopy screening vs diagnostic rules, polyp removal methods, and liver disease diagnosis.

Key Diagnoses: K21.9, K58.0, K50.90, K57.30, Z12.11, D12.6
Key Procedures: 43239, 43235, 45378, 45380, 45385, G0105, G0121
CPC Exam Tip: Multiple endoscopy payment reduction rules, distinguishing cold snare versus hot snare polyp removals, and endoscopy incomplete procedure modifier 53.
Open Gastroenterology Hub →

Why Specialty-Specific Coding Precision Matters

Medical necessity rules, local coverage determinations (LCDs), and national coverage determinations (NCDs) differ dramatically across clinical specialties. A diagnosis code that supports medical necessity for a routine primary care visit may trigger an immediate claims denial when billed with a specialized cardiovascular catheterization or complex orthopedic reconstruction.

Our clinical hubs give certified coders, medical billers, and practice managers targeted guidance tailored to each specialty's unique documentation challenges, high-risk audit areas, and payer policy nuances.