Where coding fits in the billing workflow
Clinical documentation describes why the patient was seen and what services were performed. Coding translates that documentation into standardized code sets used on claims. Billing then uses those coded services, along with patient, provider and insurance information, to prepare and follow the claim.
The three code-set families billers see most often
ICD-10-CM
Used to report diagnoses, symptoms, conditions and other reasons for an encounter in U.S. healthcare billing.
CPT
Used widely to report physician and other professional procedures and services. CPT is maintained and copyrighted by the American Medical Association.
HCPCS Level II
Used for many products, supplies and services not represented by CPT, including selected drugs, DME and ambulance services.
Why billers need coding knowledge
- Claims may reject when a required code is missing or invalid.
- Payers may deny a service when diagnosis and procedure information do not support the billed service under applicable policy.
- Modifiers can change how a service is interpreted.
- Incorrect units, code combinations or dates can create payment problems.
- Billing staff need to know when to correct administrative data and when to send an issue back to coding or clinical staff.
Quick knowledge check
Which code set primarily describes diagnoses?
ICD-10-CM.
Which code set is maintained by the AMA?
CPT.
Should a biller guess a code because it appears likely to get paid?
No. Code selection must be supported by documentation and applicable coding rules.
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