2027 Coding Guide for OMS
An essential coding, billing and reimbursement gui
The Coding Guide for OMS is your one-stop coding, reimbursement, and documentation resource developed exclusively for OMS. This comprehensive and easy-to-use guide is updated for 2027 and organized by specialty-specific CDT and CPT® codes. Each code includes its official description and lay description, coding tips, documentation and reimbursement tips, Medicare edits, and is cross-coded to common ICD-10-CM diagnosis codes to complete the coding process. Getting to the code information you need has never been so easy.
- Evaluation and Management (E/M) Services Guidelines. E/M codes are used every day in your practice. With CPT® E/M Guidelines and our Optum Coding Tips, you have all the information you need to select the correct E/M code for the service provided.
- Quickly find information. All the information you need is provided, including CPT® and CDT full code descriptions, lay descriptions, coding tips, procedure code-specific documentation and reimbursement tips, clinical terms, Medicare edits and IOM references, and Medicare Unlikely Edits MUE), and commonly associated ICD-10-M diagnosis codes.
- Procedure code icons. Quickly identify new, revised, add-on, and telemedicine procedure codes, making your coding process for procedures and E/M services quick and efficient.
- ICD-10-CM code icons. Icons identify age-related and laterality diagnosis codes.
- Easily determine fees for your practice and reinforce consistency in the charges. Relative value units including the practice, work, and malpractice components for CPT codes with the total RVUs for non-facility and facility also included.
- CPT® Assistant references. Identify that an article or discussion of the CPT® code has been in the American Medical Association’s CPT® Assistant newsletter. Use the citation to locate the correct volume.
- Helpful illustrations. The detailed illustration section provides a better understanding of anatomy.
- CCI edits by CPT®, CDT and HCPCS procedure codes. CPT®, CDT and HCPCS procedure codes with their associated CCI edits are provided in a special section. Quarterly updates for CCI edits, and other significant updates for this Coding Guide are available online at Optumcoding.com, Product Update page.
CPT is a registered trademark of the American Medical Association. CDT © 2026 American Dental Association.
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