3.3 Insurance Fundamentals: Medicare, Medicaid & Commercial Plans

Financial clearance and eligibility verification are meaningless without a working knowledge of the payer landscape itself. The CHAA exam expects candidates to correctly identify what each major coverage type actually pays for, who administers it, and how it differs from its neighbors — because misidentifying a plan type at pre-registration leads directly to wrong eligibility checks, wrong estimates, and wrong claims.

Medicare: Parts A, B, C, and D

Medicare is the federal health insurance program primarily for people age 65 and older, plus certain younger people with qualifying disabilities or End-Stage Renal Disease. It is split into four distinct parts, and confusing them is one of the most common exam traps:

Original Medicare refers to Parts A and B together, administered directly by CMS with standardized rules nationwide. Medicare Advantage (Part C) replaces Original Medicare with a private plan that must cover at least what A and B cover, but often adds extra benefits and uses network restrictions — meaning a Medicare Advantage patient is subject to commercial-style network and authorization rules, not the traditional Medicare fee schedule. Access staff must correctly identify which "Medicare" a patient actually has, because the verification process, authorization requirements, and even the applicable notices (like the Important Message from Medicare) differ between Original Medicare and Advantage plans.

Medicaid

Medicaid is a joint federal-state program providing coverage for eligible low-income individuals, families, pregnant women, people with disabilities, and — in expansion states — other qualifying low-income adults. Because states administer their own Medicaid programs within federal guidelines, coverage rules, eligibility thresholds, and even the program's local name vary by state. Some patients may be dually eligible for both Medicare and Medicaid ("dual eligibles"), which changes coordination-of-benefits logic and cost-sharing responsibility. Access associates should never assume Medicaid rules are uniform across state lines and should verify eligibility against the specific state program the patient is enrolled in.

Commercial Insurance and Plan Structures

Commercial insurance is coverage obtained through an employer, purchased individually, or obtained through a health insurance marketplace. Commercial plans are built around network structures that determine how much of a patient's care is covered and where they are allowed to receive it:

• HMO (Health Maintenance Organization) — requires a primary care provider and referrals to see specialists; care is generally covered only in-network.
• PPO (Preferred Provider Organization) — no referral required; offers both in-network and out-of-network coverage, though out-of-network costs more.
• EPO (Exclusive Provider Organization) — like a PPO with no referral requirement, but no out-of-network coverage except emergencies.
• POS (Point of Service) — a hybrid requiring a primary care referral (like an HMO) but allowing some out-of-network coverage (like a PPO).

Other Government Programs and Self-Pay

Two additional categories round out the payer landscape tested on the CHAA exam:

1. TRICARE — the health program for active-duty service members, military retirees, and their families, administered through the Department of Defense; TRICARE has its own referral, authorization, and network rules distinct from Medicare or commercial plans.
2. Self-pay / uninsured — patients with no third-party payer, for whom the access associate's role shifts toward direct financial counseling, Good Faith Estimates, and financial-assistance screening rather than insurance verification (covered fully in Section 3.5).

Why Plan-Type Identification Matters

Correctly identifying plan type at pre-registration is not academic — it determines which eligibility transaction to run, whether a referral or authorization is required, which notices must be issued (an Important Message from Medicare applies to Medicare inpatients, not commercial patients), and how the claim must ultimately be billed. A patient access associate who registers a Medicare Advantage patient as if they were Original Medicare risks skipping a required prior authorization step that the Advantage plan — unlike Original Medicare for most services — actually enforces.

Reading an Insurance Card Correctly

A practical skill tied to this section is reading an insurance card accurately, since the card itself often signals plan type before any electronic verification is run. Key fields to scan include the payer name and logo, the member/subscriber ID, the group number, the plan type abbreviation (often printed directly on the card, such as HMO, PPO, or a Medicare Advantage plan's marketing name), and the customer service or precertification phone number, which differs by plan and is the fastest path to confirming referral or authorization requirements. Cards for Medicare Advantage plans are frequently mistaken for commercial cards because they are issued by the same private insurers that sell standard commercial products — the distinguishing detail is language identifying the plan as a "Medicare Advantage," "MA," or "Part C" product, which the associate should look for specifically rather than assuming from the insurer's brand name alone.

Guarantor vs. Subscriber, Revisited

Because plan type and financial responsibility are so closely linked, it is worth reinforcing the distinction introduced in Section 3.2: the subscriber is the person whose employment or enrollment created the coverage (and whose ID number appears on the card), while the guarantor is whoever the facility holds responsible for payment. For a self-pay patient, these roles collapse into a single person alongside the patient identity itself; for a dependent covered under a parent's plan, they diverge. Keeping these roles straight when identifying plan type prevents the compounding error of running an eligibility check under the wrong person's ID.