Free preview: This is Chapter 1 of Medical Billing Jobs in Pakistan: A Complete Guide to Production, AR Follow-Up and Interviews, shown in full. The whole book has 14 chapters and is free with a free account.
It covers how medical billing jobs in Lahore, Karachi, Islamabad and other Pakistani cities work: the production and follow-up departments, whether offshore billing is legal, advertised pay, how to prepare, and 115 interview questions with answers, including terminology, the billing cycle, CARC and RARC codes and common denials.
Chapter 1: What Medical Billing Is, in Plain English
Last checked: 15 October 2026. Job listings, pay and rules change, so confirm anything important before you act. This guide is educational and is not legal, tax or career advice.
When someone visits a doctor in the United States, the doctor’s office does not simply ask them to pay. Most of the bill goes to the patient’s health insurance company, called the payer. Someone has to turn what the doctor did into a standard request for payment, called a claim, send it to the payer and make sure the money arrives. That work is medical billing. The whole journey, from booking the appointment to collecting the last dollar owed, is called revenue cycle management (RCM).
The life of a claim
- Registration. The patient’s details and insurance information are recorded.
- Eligibility check. Someone confirms that the insurance is active and what it covers. Some services also need prior authorization, which means the payer’s approval in advance.
- Coding. The visit is turned into codes: ICD-10-CM codes for diagnoses, and CPT or HCPCS codes for procedures and services.
- Charge entry. The services and codes are entered in the billing system, usually from a form called a superbill.
- Claim submission. The claim is checked and sent, normally electronically through a clearinghouse. Doctors’ claims use the CMS-1500 format and hospital claims use the UB-04 format.
- Payer decision. The payer pays, denies or rejects the claim.
- Payment posting. The payment and the payer’s explanation are recorded against the patient’s account.
- Follow-up. Claims that are late, underpaid or denied are chased, corrected or appealed.
- Patient billing. Whatever the patient owes is billed to the patient.
Words you will hear on day one
- Provider: the doctor, clinic, lab or hospital that gives care.
- Payer: the insurance company or government program, such as Medicare or Medicaid, that pays.
- Clearinghouse: a service that checks claims and passes them electronically to payers.
- EOB, ERA and EFT: the explanation of benefits (paper) and electronic remittance advice explain how the payer processed a claim. The electronic funds transfer is the actual money.
- Clean claim: a claim with no errors, which can be processed without asking for more information.
- Rejection and denial: a rejected claim was never accepted for processing and is fixed and sent again. A denied claim was processed and refused, and may need a correction or an appeal.
- Copay, deductible and coinsurance: the parts the patient pays: a fixed fee per visit, the amount paid before insurance starts to pay, and a percentage shared after that.
- Timely filing: the deadline for submitting a claim. Medicare’s is 12 months from the date of service, and other payers set their own.
- Days in AR: a measure of how long, on average, money stays unpaid.
What the rest of the book covers
- Chapter 2: Why US Billing Work Comes to Pakistan
- Chapter 3: Medical Billing Jobs in Lahore, Karachi, Islamabad and Other Cities
- Chapter 4: Production and Follow-Up: The Two Departments
- Chapter 5: Is Offshore Medical Billing Legal?
- Chapter 6: How to Prepare Before You Apply
- Chapter 7: How Hiring Usually Works
- Chapters 8 to 12: 115 Interview Questions and Answers (basics, terminology, the billing cycle, CARC and RARC codes, common denials and scenario drills)
- Chapter 13: Your First 90 Days and Career Path
- Chapter 14: Summary: The Whole Guide on One Page
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