ACOG's Coding Quick Reference Guides are a valuable resource for obstetrician-gynecologists and their staff, providing quick and easy access to the most up-to-date diagnosis and procedural codes for billing ob-gyn services. The OB/GYN Evaluation & Management (E/M) Services Coding Quick Reference Guide has been newly revised to provide quick reference to current and newly updated CPT codes for inpatient, outpatient, observation, consultation, emergency department visits, elements of medical decision-making, and modifiers. With this guide at their fingertips, ob-gyn providers and their staff can ensure they are using the correct codes to accurately bill for their services.