NCMA Medical Billing and Coding 2 — Questions and Answers

Question 1: What does the acronym CPT stand for in medical billing?

Current Procedural Terminology (Correct answer)
Common Patient Treatment
Coded Procedure Terminology
Clinical Practice Table

Correct answer: Current Procedural Terminology

CPT (Current Procedural Terminology) is a medical code set maintained by the American Medical Association (AMA) used to describe medical, surgical, and diagnostic services for billing and documentation purposes.

CPT codes are five-digit numeric codes categorized into Category I (procedures and services), Category II (performance measurement), and Category III (emerging technologies). They are used on insurance claim forms (CMS-1500) to communicate what services were provided. CPT codes must be paired with ICD-10-CM diagnosis codes to support medical necessity. The AMA updates CPT codes annually; medical assistants involved in billing must use the current year's edition to avoid claim denials.

Question 2: What is the purpose of the ICD-10-CM coding system in healthcare billing?

To classify and code diagnoses, symptoms, and reasons for patient encounters for billing and statistical purposes (Correct answer)
To describe the specific procedures performed during a visit
To list all medications prescribed to a patient
To document the physician's treatment plan only

Correct answer: To classify and code diagnoses, symptoms, and reasons for patient encounters for billing and statistical purposes

ICD-10-CM (International Classification of Diseases, 10th Revision, Clinical Modification) codes classify diseases, conditions, injuries, and reasons for healthcare encounters, supporting billing, reimbursement, epidemiology, and quality reporting.

ICD-10-CM codes have up to 7 characters, with the first character always a letter. The codes provide high specificity: for example, fractures specify laterality, initial versus subsequent encounter, and sequela. Accurate ICD-10-CM coding is essential because payers require codes that justify medical necessity for the procedures billed. Upcoding (billing a more severe diagnosis than documented) or undercoding (billing a less severe diagnosis to avoid scrutiny) constitute fraud and can result in penalties, audits, and exclusion from Medicare/Medicaid.

Question 3: On a CMS-1500 claim form, where is the patient's primary diagnosis code entered?

Box 21 (Diagnosis or Nature of Illness or Injury) (Correct answer)
Box 11 (Insured's Policy Group or FECA Number)
Box 24D (Procedures, Services, or Supplies)
Box 33 (Billing Provider Info & Phone)

Correct answer: Box 21 (Diagnosis or Nature of Illness or Injury)

Box 21 of the CMS-1500 form is where up to 12 ICD-10-CM diagnosis codes are entered; each procedure code in Box 24D then references the applicable diagnosis code(s) by letter (A–L) to show medical necessity.

The CMS-1500 form is the standard paper claim for physician and outpatient services. Box 21 allows up to 12 diagnosis codes labeled A through L. In Box 24E (Diagnosis Pointer), the medical assistant or biller enters the letter(s) corresponding to the diagnosis code(s) in Box 21 that support each procedure in Box 24D. Linking the correct diagnosis to each procedure is critical for claim approval; a mismatch triggers denials or requests for additional documentation.

Question 4: What is an Explanation of Benefits (EOB)?

A document from the insurance company detailing what was billed, what was allowed, what was paid, and what remains the patient's responsibility (Correct answer)
A form the patient signs before receiving care
The physician's clinical note from the encounter
A request for additional information from the insurer

Correct answer: A document from the insurance company detailing what was billed, what was allowed, what was paid, and what remains the patient's responsibility

An Explanation of Benefits (EOB) is sent by the insurer after processing a claim, summarizing the billed amount, allowed amount, insurer's payment, contractual adjustment, and any balance owed by the patient.

The EOB is not a bill — it is an informational document. Key fields include: billed amount (what the provider charged), allowed amount (what the payer contractually allows), insurer paid amount (what insurance covered), copay/coinsurance/deductible (patient's share), and any denial reason codes. Medical assistants reviewing EOBs must check for underpayments, incorrect adjustments, and denied lines that should be appealed. Understanding EOBs is essential for accurate patient billing and accounts receivable management.

Question 5: What is a superbill (encounter form) used for in a medical office?

A pre-printed or electronic form listing common diagnosis and procedure codes used to document services rendered during a patient visit for billing purposes (Correct answer)
A document listing the patient's current medications
An insurance verification form completed before the visit
A form used to request medical records from another facility

Correct answer: A pre-printed or electronic form listing common diagnosis and procedure codes used to document services rendered during a patient visit for billing purposes

A superbill is an itemized receipt of services that lists the provider's common CPT and ICD-10-CM codes; the provider checks off the services rendered and diagnoses, which the billing staff then uses to generate the claim.

Superbills streamline the coding process by presenting a practice-specific list of commonly used codes. They typically include: patient and provider demographics, date of service, E/M level codes (99211–99215), procedure codes, diagnosis codes, modifiers, and referring provider information. Electronic superbills in EHR systems generate claims automatically when the provider completes the encounter note. Accuracy in checking off the correct codes on the superbill directly determines whether the practice is paid correctly and promptly.

Question 6: What does it mean when an insurance claim is 'denied' versus 'rejected'?

A denial is processed but payment is refused (can be appealed); a rejection is returned before processing due to errors (must be corrected and resubmitted) (Correct answer)
Denial and rejection both mean the same thing
A rejection is worse than a denial and cannot be corrected
A denial is returned before processing; a rejection is processed but underpaid

Correct answer: A denial is processed but payment is refused (can be appealed); a rejection is returned before processing due to errors (must be corrected and resubmitted)

A rejected claim is returned to the submitter before processing because of technical errors (missing data, invalid codes); a denied claim is processed by the payer but payment is refused for clinical or coverage reasons — denials can be appealed but rejections must be corrected first.

Common rejection reasons: missing NPI or subscriber ID, invalid CPT/ICD-10 code format, duplicate claim. Common denial reasons: service not covered, lack of prior authorization, medical necessity not established, patient not eligible on date of service, timely filing exceeded. Denied claims should be evaluated for appeal: if the service was medically necessary and properly documented, a well-prepared appeal with supporting clinical notes often reverses the denial. Medical assistants must understand both to manage accounts receivable effectively.

NCMA Medical Billing and Coding 2

What does the acronym CPT stand for in medical billing?