HCR 201 Week 5 Codes in the Medical Billing Cycle Example

From Exam Room to Remittance in Nineteen Days: Following One Coded Visit Through the Billing Cycle, Including the Line That Came Back Denied

[Student Name]

University of Phoenix

HCR/201: Medical Billing and Coding

Week 5 Assignment

[Instructor Name]

[Date]

The patient, the practice and the claim are composites written for a model paper; claim form rules and code sets come from the sources listed.

A composite patient in his sixties, living with diabetes, early kidney disease and high blood pressure, came to his family physician for a scheduled follow-up. During the visit, the physician adjusted his diabetes medicine, ordered an electrocardiogram because he reported occasional palpitations and drew blood for kidney function tests sent to an outside laboratory. Nineteen days later, the practice had been paid for most of the visit and was waiting on one line. This paper follows his visit through the billing cycle and shows how the codes learned in this course carried it from the exam room to the practice's bank account.

Step One: Registration and Eligibility

At check-in, the front desk scanned his insurance card and ran an electronic eligibility check, confirming active coverage, his copayment and that the plan did not require a referral for primary care. Many denials begin here with a wrong member number or expired coverage, so the check prevents problems later.

Step Two: The Visit and Documentation

The physician's note recorded the history, examination, assessment and plan. In the assessment the physician wrote that the diabetes had damaged the kidneys to stage 3a, that blood pressure was also involved and that palpitations needed a tracing, with the medication change and the electrocardiogram order.

Step Three: Code Assignment

The billing and coding specialist assigned diagnosis codes E11.22, N18.31, I12.9 and R00.2 for palpitations, following the official guidelines on combination codes and presumed relationships (National Center for Health Statistics, 2025). Procedure codes were 99214 for the office visit at moderate decision making, 93000 for the complete electrocardiogram and 36415 for the blood draw. The laboratory tests themselves would be billed by the outside laboratory.

Step Four: Charge Entry

The codes were entered into the practice management system with the practice's charges for each service, creating the claim.

Step Five: Building the Claim

On the professional claim, whose paper version is the CMS-1500, diagnosis codes go in item 21 in priority order, lettered A through L. Each service line in item 24 carries the date, place of service, procedure code with any modifiers, a diagnosis pointer in item 24E linking the service to the diagnosis that justifies it, the charge and the units. The Medicare Claims Processing Manual instructs that the pointer relate each service to its primary supporting diagnosis (Centers for Medicare & Medicaid Services, 2024). The specialist pointed 99214 to A, the diabetes code, and 36415 to B, the kidney disease stage.

Step Six: Claim Scrubbing

The practice's software checked the claim against payer rules and national correct coding edits, which flag code pairs that should not normally be billed together (Centers for Medicare & Medicaid Services, n.d.). No edit fired, but the scrubber warned that the electrocardiogram line pointed to diagnosis A, diabetes, which the payer's policy did not list as a reason for an electrocardiogram. The warning was set to advisory rather than blocking, and the claim went out. The scrubber saw the problem; the workflow let it pass.

Step Seven: Submission and Adjudication

The claim went electronically, in the standard format that replaced paper forms for most practices, through a clearinghouse to the payer, which checked eligibility, coding validity, edits, coverage policies and the payment schedule, a process called adjudication.

Step Eight: The Remittance Advice

Nineteen days after the visit, the electronic remittance advice arrived. The office visit and blood draw were paid at the contracted rates minus the patient's copayment. The electrocardiogram line was denied with group code CO, meaning a contractual obligation the practice cannot bill to the patient, and a reason code indicating the service was not deemed medically necessary by the payer.

Step Nine: Correcting the Denial

The specialist reviewed the note. The physician had ordered the electrocardiogram for palpitations, documented as R00.2, but the line pointed to the diabetes code. She changed the pointer on the electrocardiogram line to D, the palpitations code, and submitted a corrected claim. The payer paid it 12 days later.

Step Ten: Patient Billing

After insurance payments, the patient owed only his copayment, collected at check-in, so no statement was sent. Had his plan applied a deductible, the remaining balance would have appeared on a statement with a clear explanation of each service.

What the Error Cost

The pointer error delayed payment for one line by 12 days and took 20 minutes of rework, including a call to the payer to confirm that a corrected claim, rather than an appeal, was the right route. Across the practice, about 3% of claims needed correction last quarter, each taking an average of 18 minutes, the equivalent of several working days a month.

The Specialist's View of the Cycle

Following this claim changed how the new specialist sees her work. Coding is not the end of her job but the middle of a chain that starts at the front desk and ends with a payment posted to the patient's account. An error at any link, a wrong member number, a vague note, a mispointed line or a missed follow-up, shows up days later as a denial. She now reviews the week's denials by step in the cycle, not only by payer, so the practice can see whether problems begin at registration, in documentation or in coding.

Preventing the Next One

The practice changed the scrubber warning on diagnosis pointers to a hard stop requiring review, added a training session on pointers and now tracks denials by reason each week.

Conclusion

One routine visit used every code set in the course: ICD-10-CM for the reasons for care, CPT for the services and HCPCS rules on the claim form. The billing cycle carried those codes from registration through documentation, coding, the claim form, scrubbing, adjudication and remittance to payment. A single mispointed line showed how a small coding decision affects cash flow and why each code must be linked to the diagnosis that justifies it.

References

Centers for Medicare & Medicaid Services. (2024). Medicare claims processing manual: Chapter 26, completing and processing Form CMS-1500 data set. https://www.cms.gov/regulations-and-guidance/guidance/manuals/downloads/clm104c26pdf.pdf

Centers for Medicare & Medicaid Services. (n.d.). National Correct Coding Initiative (NCCI) edits. https://www.cms.gov/medicare/coding-billing/national-correct-coding-initiative-ncci-edits

National Center for Health Statistics. (2025). ICD-10-CM official guidelines for coding and reporting FY 2026. https://www.cms.gov/files/document/fy-2026-icd-10-cm-coding-guidelines.pdf