Which coding system focuses specifically on services, supplies, and ambulance services?

The correct answer is the coding system that focuses on services, supplies, and ambulance services, which is HCPCS Level II Codes. HCPCS, or Healthcare Common Procedure Coding System, is specifically designed to include a range of non-physician services, items, and procedures that are not encompassed by CPT codes. This system covers durable medical equipment, prosthetics, orthotics, and ambulance services, which is crucial for billing and healthcare management.

CPT codes, while comprehensive for medical procedures and services performed by healthcare providers, do not cover the same range of supplies and services as HCPCS Level II codes. ICD-10-CM codes are primarily used for diagnostic coding, detailing patient conditions rather than the services or supplies provided. DRG codes pertain to diagnosis-related groups, which are used in the inpatient setting for payment categorization and do not focus on individual services or supplies.

In summary, HCPCS Level II Codes serve a specific role in coding for services, supplies, and ambulance services, which is why it stands out as the correct choice for this question.