The medical billing knowledge base
Clear, practical explanations of the revenue cycle — claims, denials, payments, and credentialing. Learn by topic, or follow a guided path.
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Every category is a pillar with in-depth articles beneath it. Start anywhere — each article stands on its own and links to the next.
Revenue Cycle Management
Understand the healthcare revenue cycle — what it is, how its stages fit together, and the articles, services, and tools that teach and support each part.
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- What Is Revenue Cycle Management (RCM)?
- The Stages of the Revenue Cycle, in Depth
- Revenue Cycle KPIs: Reading the Metrics Together
Claims
Understand what a medical claim asserts, the gates it passes on the way to a decision, what makes it clean, how it is submitted, and how to find the ones that go quiet.
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Explore all 28 articlesDenials & Appeals
Understand why claims get denied, how to read what the payer sent back, when to appeal rather than correct, and how to stop the denials being created at all.
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- What Is a Claim Denial?
- Why Claims Get Denied
- Reading a Denial: Codes, Group Codes, and the Remittance
Payments & Posting
Understand what a paid claim actually says — the allowed amount, the adjustments, and the patient's share — how it is posted, reconciled, and where the money quietly goes missing.
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- From Billed Charge to Collected Dollar
- How Payment Posting Works
- Payment Reconciliation: Proving the Cash
Credentialing
Understand why a credentialed provider still cannot bill, how enrollment differs by payer, which date decides whether claims pay, and how records lapse.
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- Credentialing vs. Enrollment
- Effective Dates: When a Provider Can Actually Bill
- Enrollment Pathways: Medicare, Commercial, Individual, Group
Eligibility verification
Confirm before the visit that a patient's coverage is active, that the plan covers the planned care, and what the patient will owe — the earliest and cheapest place to prevent a denial.
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- What Is Eligibility Verification?
- Eligibility vs. Benefit Verification
- How Electronic Eligibility Checks Work
Prior authorization
Confirm before the service whether a payer requires advance approval, obtain it, and make sure the claim matches what was authorized — the front-end control that prevents an often-unappealable category of denial.
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Explore all 21 articlesMedicare billing
How the Medicare program is structured and billed — its parts, contractors, identifiers, coverage and payment rules, and the denials specific to Medicare.
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Explore all 32 articlesMedicaid billing
How Medicaid — the joint federal-state program administered state by state — is structured and billed, from eligibility and enrollment to managed care, coordination rules, and program-specific denials.
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Explore all 21 articlesBehavioral health billing
The billing considerations specific to behavioral health care — time-based psychotherapy, group and medication-management services, substance-use treatment, parity, carve-outs, documentation, and confidentiality.
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Explore all 20 articlesCompliance and Regulations
Federal laws and CMS requirements that shape how providers bill, what they must disclose to patients, and which balance bills are prohibited.
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Explore all 26 articlesPatient Billing & Collections
What happens to a balance once it becomes the patient's — statements, payment plans, financial assistance, discounts, and the decisions that close an account.
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Explore all 17 articlesCoding, Modifiers & Edits
The layer between coding and payment: what a modifier changes, which edits stop a claim, and how units, linkage, and sequencing decide whether a line pays.
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- What a Modifier Actually Changes
- The Documentation Standard Behind Modifier 25
- The X Modifiers: Saying Which Kind of Distinct
Payer Contracts & Reimbursement
The agreement the rest of the revenue cycle silently depends on — which clause sets your rates, your filing window, your appeal rights, and your exit.
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Explore all 17 articlesA/R & Follow-Up
The receivable as a book of business — how it is segmented, prioritized, staffed, reported, and reconciled, rather than how one claim is chased.
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- Designing an A/R Follow-Up Process
- What an A/R Aging Bucket Hides
- The 276/277 Claim Status Transaction
Follow a guided path
Structured routes through the material — start at the beginning or go straight to the deep end. Articles are added to each step as they are published.
Beginner path
New to medical billing? Start here and build a foundation, step by step.
Advanced path
Already billing? Go deeper into the work that protects and recovers revenue.
- 01Denial codes and root-cause analysis
- 02Coding accuracy and audit readiness
- 03A/R management and revenue-cycle KPIs
- 04Payer-specific processes
- 05Compliance essentials
Fresh and maintained
The knowledge base is a living reference, not a feed. Recently updated articles surface here.
- Denials & AppealsThe Timely Filing Appeal Letter: The Two Arguments That WorkUpdated · 11 min read
- Prior authorizationThe Medicare Advantage Utilization Management CommitteeUpdated · 11 min read
- Medicare billingGLP-1 Coverage Under Medicare: The Exclusion Is About the UseUpdated · 16 min read
- Medicaid billingThe Medicaid community engagement requirementUpdated · 15 min read
- Compliance and RegulationsSection 1557 of the Affordable Care ActUpdated · 12 min read
- ClaimsThe HIPAA Claims Attachment StandardUpdated · 9 min read
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