When I started building in healthcare, I couldn’t follow a single conversation. Every sentence had three acronyms I didn’t know. ACO, IDN, LTAC, FQHC — the industry speaks in alphabet soup, and nobody hands you a menu.
So I learned the language the hard way: by mapping the problem statements. Who pays, who gives care, where it happens, who makes and moves the stuff, and the invisible plumbing underneath. Here’s the whole cast, in plain English, organized by what each one actually does. For each: the one-line incentive — because if you understand what someone gets paid for, you understand what they’ll do — and a real name, so the abstraction has a face.
The money — who pays
Health plan / payer — the insurance company. Collects premiums, pays claims. Think UnitedHealthcare, Elevance (the new Anthem), Aetna, Cigna, and the Blues. Incentive: pay out less than they take in.
MCO (managed care organization) — the generic term for a managed-care plan. Most Medicaid isn’t run by states directly anymore; it’s run by MCOs like Centene and Molina. Most Medicare Advantage plans are MCOs too.
Employer — most working-age Americans get insurance through work. Many big employers are “self-funded”: they pay the actual medical bills themselves and just hire someone to do the paperwork.
TPA (third-party administrator) — does that paperwork for self-funded employers. UMR and Meritain are the big ones. Fee for service, zero risk.
PBM (pharmacy benefit manager) — the drug middleman. Decides which drugs your plan covers, negotiates with drugmakers. Three run most of it: CVS Caremark, Express Scripts, Optum Rx. Incentive: the spread between the negotiated price and the charged price.
MA (Medicare Advantage) — private plans that replace traditional Medicare. UnitedHealthcare and Humana are the giants. The plan gets a fixed monthly check per member and keeps whatever it doesn’t spend. Full risk, full reward.
Medicare — federal insurance for 65+. Medicaid — federal-plus-state for low-income. CMS — the agency running both. CMS sets the prices, and the whole industry follows its lead.
The providers — who gives care
PCP (primary-care physician) — your main doctor, the one who owns your overall picture. The quarterback.
Specialist — the expert your PCP sends you to: cardiologist, dermatologist, orthopedist. Deep in one area, usually by referral.
Health system — owns hospitals, employs doctors. Baylor Scott & White, HCA, Ascension, CommonSpirit.
IDN (integrated delivery network) — a health system that also owns the insurance plan. Kaiser Permanente is the classic: they collect your premium and employ your doctor. The fortress.
ACO (accountable care organization) — a group of doctors and hospitals that tells Medicare: “Give us 10,000 patients. If we keep them healthy and under budget, we share the savings.” Paid for the total, not the visit.
CIN (clinically integrated network) — independent doctors and hospitals banding together to coordinate care and negotiate as one bloc, without merging. Most big systems run one.
IPA (independent practice association) — the older version of the CIN: independent docs contracting jointly, sometimes taking on risk themselves.
MSO (management services organization) — does the unglamorous admin for doctor groups: billing, HR, IT, compliance. By law it can’t make clinical decisions or touch clinical money.
FQHC (federally qualified health center) — the community clinics. Serve everyone regardless of ability to pay, get federal funding. Your neighborhood health center with a federal designation.
Direct primary care — membership medicine. You pay the doctor directly, monthly, no insurance involved. The opt-out.
The places — where care happens
ED (emergency department) — the hospital ER. Urgent care — the middle ground: CityMD, MedExpress, Concentra.
Retail clinic — the MinuteClinics inside CVS and Walgreens. Strep tests and flu shots, no appointment.
ASC (ambulatory surgery center) — outpatient operations. Same surgery as a hospital, much cheaper building. SCA and AmSurg run thousands of them.
SNF (skilled nursing facility) — rehab and nursing after a hospital stay. Genesis and Life Care Centers are the big chains.
LTAC (long-term acute care hospital) — weeks-long stays for the very sick: ventilator weaning, complex wounds. Kindred built the category.
IRF (inpatient rehab facility) — intense rehab after stroke or trauma; patients must tolerate three hours of therapy a day. Encompass Health is the giant.
Home health — nurses and therapists who visit you at home. LHC Group and Amedisys are the national names.
Hospice — end-of-life comfort care, usually at home. VITAS is the largest. Different philosophy: comfort, not cure.
Dialysis center — kidney failure is its own industry. DaVita and Fresenius run most of it.
Lab — Quest Diagnostics and Labcorp. The duopoly behind nearly every blood test.
Imaging center — outpatient radiology. RadNet is the biggest. An MRI without the hospital markup.
CAH (critical access hospital) — tiny rural hospitals (25 beds or fewer) that Medicare keeps alive with cost-based payments, because otherwise rural America has no hospital at all.
DME (durable medical equipment) — wheelchairs, oxygen, CPAP machines. AdaptHealth and Lincare are the national suppliers. Nobody thinks about them until they need one.
The supply chain — who makes and moves the stuff
Pharma — the drug manufacturers: Pfizer, Merck, Eli Lilly, Johnson & Johnson. They invent the drugs; everyone else argues over the price.
Distributor — the wholesalers between pharma and your pharmacy: McKesson, Cencora, Cardinal Health. Three companies move most of America’s drugs.
GPO (group purchasing organization) — hospitals’ buying cooperatives. Vizient and Premier negotiate bulk prices for thousands of hospitals at once.
Pharmacy — the last mile of the drug chain: CVS, Walgreens, Walmart, plus mail-order and specialty pharmacies for the expensive stuff.
The plumbing — the invisible infrastructure
Clearinghouse — routes insurance claims between providers and payers. Availity and Change Healthcare do most of it. Invisible until it breaks — and when it breaks, nobody gets paid.
EHR vendor — the medical record software. Epic runs the big systems; Oracle Health (the old Cerner) runs many of the rest. The rails the industry runs on.
RCM (revenue cycle management) — companies that do billing for providers who can’t afford their own department. R1 and Ensemble Health Partners are the big names.
The government, as provider and referee
VA (Veterans Affairs) — the country’s biggest IDN that nobody calls an IDN: owns the hospitals, employs the doctors, covers the members. If you served, this is your system.
FDA — decides which drugs and devices are allowed to exist. The gatekeeper of the entire supply side.
The one idea underneath it all
Fee-for-service (pay per thing done — rewards volume) versus value-based care (pay for the outcome — rewards health). ACOs, MA plans, CINs — they’re all attempts to drag the system from the first to the second.
And here’s why I’m learning all this: the customers of FabrixMed live in the provider group — ACOs, FQHCs, independents, EDs. The fortress outfits (IDNs, big MA plans) already have the incentive and the plumbing to close loops. Everyone else is the frontier. That’s the whole business in one sentence.