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 25 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 20 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 20 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 20 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 articlesFollow 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.
- Revenue Cycle ManagementRevenue Cycle Governance: Ownership and Decision RightsUpdated · 3 min read
- ClaimsFrom Encounter to Billable ChargeUpdated · 2 min read
- Eligibility verificationWhat Is Eligibility Verification?Updated · 4 min read
- Prior authorizationWhat is prior authorization?Updated · 8 min read
- CredentialingWhat is provider credentialing?Updated · 6 min read
- Medicare billingHow Medicare is structured (Parts A, B, C, D)Updated · 7 min read
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Plain-language definitions of the terms you will meet across the revenue cycle.
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