Evaluation and Management Services (MLN006764)
by Medicare Learning Network · Centers for Medicare & Medicaid Services
CMS guide to coding and billing office, hospital and other E/M visits. Explains level selection by medical decision making or total time, split/shared and teaching-physician rules, prolonged services, and the documentation Medicare expects to support each level.
More resources on Medical Coding & Billing
Buck's Step-by-Step Medical Coding, 2026 Edition
Best single guided path through all code sets. Widely used coding textbook that teaches ICD-10-CM, CPT, HCPCS and inpatient ICD-10-PCS coding in sequence, with reimbursement basics and practice exercises after each concept. Common in accredited coding programs and CPC and CCA exam preparation.
Medicare NCCI Policy Manual
CMS manual behind the National Correct Coding Initiative edits, organized by CPT section. Explains which code pairs cannot be billed together, when modifiers such as 59 and the X{EPSU} set may bypass an edit, and medically unlikely edit limits.
Medicare Billing: Form CMS-1500 and the 837 Professional (MLN006976)
CMS Medicare Learning Network booklet on submitting professional claims, both on the paper CMS-1500 form and the electronic 837P transaction. Covers required claim data, the role of Medicare Administrative Contractors, and common reasons claims are rejected.
ICD-10-CM Official Guidelines for Coding and Reporting (FY 2027)
The rulebook every coder and every certification exam tests against; no substitute exists. The HIPAA-mandated rules for assigning ICD-10-CM diagnosis codes, approved by CMS, NCHS, AHA and AHIMA. Covers code conventions, chapter-specific guidance, sequencing, and separate rules for inpatient versus outpatient reporting. Effective October 1, 2026.