Quick Take Medical billing and coding runs on three core code sets: ICD-10, CPT, and HCPCS. ICD-10 covers diagnoses. CPT covers procedures and services performed by providers. HCPCS covers Medicare-related supplies, equipment, and services not included in CPT. Every insurance claim submitted in the United States uses some combination of these three. If you want to work in medical billing and coding on Long Island, these are the systems you’ll live in every day.

Why These Three Code Sets Matter

Health care in the U.S. doesn’t run on paperwork. It runs on codes.

When a patient walks into a doctor’s office, every diagnosis, every procedure, every supply used gets translated into a code. Those codes are what insurance companies, Medicare, and Medicaid use to decide what gets paid, how much, and to whom. If the codes are wrong, claims get denied, providers don’t get paid, and patients get stuck with bills that should have been covered.

That’s why medical billers and coders are the quiet engine of every hospital, physician’s office, and insurance company in the country. And it’s why ICD-10, CPT, and HCPCS are the three systems every coder has to know cold.

ICD-10-CM: The Diagnosis Codes

ICD-10-CM stands for International Classification of Diseases, Tenth Revision, Clinical Modification. It’s the code set used to document why a patient came in.

Sprained ankle? There’s a code. Type 2 diabetes? Code. Chronic migraine without aura? Also a code. ICD-10-CM has more than 70,000 codes covering nearly every diagnosis a physician might document.

The reason it matters so much: ICD-10 codes establish medical necessity. Insurance companies want to know that a procedure was actually justified by the patient’s condition. The diagnosis code is how that justification gets communicated.

There’s also ICD-10-PCS, a separate code set used specifically for inpatient hospital procedures. Most short medical billing programs skip it. Hunter’s program teaches both, which gives graduates an edge when applying for hospital-based roles versus outpatient-only positions.

CPT: The Procedure and Service Codes

CPT stands for Current Procedural Terminology. It’s maintained by the American Medical Association and used to report what the provider actually did during the visit.

Office visits, lab tests, surgeries, imaging, vaccinations, physical therapy sessions, all of it gets coded with CPT. There are roughly 11,000 CPT codes, each tied to a specific service or procedure.

CPT codes are how providers get paid. The diagnosis tells the insurer why the patient was seen. The CPT code tells what was done. Both have to match up logically, or the claim gets flagged.

This is where coders earn their keep. A small CPT error can mean the difference between a clean claim and a denial that costs the practice hundreds of dollars and hours of rework.

HCPCS: The Medicare and Supplies Codes

HCPCS stands for Healthcare Common Procedure Coding System. It’s pronounced “hick-picks” in the field.

HCPCS handles the things CPT doesn’t cover well, mostly Medicare-related services, durable medical equipment, supplies, and certain drugs administered in clinical settings. Wheelchairs, crutches, ambulance transport, prosthetics, injectable medications, all live in HCPCS.

If you work with any patient population that includes Medicare beneficiaries, and on Long Island that’s a huge share of the patient base, HCPCS becomes essential.

How the Three Code Sets Work Together on a Real Claim

Picture a simple scenario. A 68-year-old patient on Medicare comes into a Long Island physician’s office complaining of knee pain. The provider examines the knee, takes an X-ray, and prescribes a knee brace.

Here’s how that visit gets coded:

• ICD-10-CM code for the diagnosis (osteoarthritis of the knee)
• CPT code for the office visit
• CPT code for the X-ray
• HCPCS code for the knee brace

All four codes go on the claim. The insurance company reviews the combination, confirms medical necessity, and processes payment. If any code is wrong, missing, or doesn’t logically connect to the others, the claim gets denied and someone has to fix it.

What You Actually Learn at Â鶹´«Ã½¹ÙÍø

Â鶹´«Ã½¹ÙÍø’s Online Medical Billing and Coding program is built around mastery of all three code sets, plus the practical software and certification prep needed to land a job after graduation.

The program runs 5 months during the day or 10 months in the evening, 100% online with a live instructor, totaling 600 hours of training across five modules. The coding instruction breaks down like this:

• Module III (Medical Coding I) CPT, HCPCS, and ICD-10-PCS, with hands-on practice using AAPC’s Practicode software
• Module IV (Medical Coding II) ICD-10-CM, focused on diagnosis coding and medical necessity
• Module V (Computerized Coding with Practicode) real-world coding scenarios that prepare students for the AAPC certification exam

Practicode is the same training platform used by AAPC, the largest credentialing organization for medical coders in the country. Students work through actual patient scenarios, not made-up textbook examples.

The program also covers anatomy and physiology, medical terminology, HIPAA compliance, electronic medical records, health insurance principles, and Microsoft Word and Excel. By graduation, students are prepared to sit for the Certified Professional Coder (CPC) and Certified Professional Biller (CPB) exams through AAPC.

Where Hunter Graduates Work on Long Island

Hunter’s local hiring network includes Northwell Health, NYU Langone, Catholic Health, Optum (ProHEALTH), CityMD, PM Pediatric Urgent Care, Good Samaritan, Orlin & Cohen, and Zwanger-Pesiri Radiology.

Common jobs graduates land include:

• Medical Biller and Insurance Coordinator
• Admissions Coordinator
• Medical Office Manager
• Patient Care Coordinator
• Patient Intake Specialist
• Surgical Scheduler
• Health Unit Coordinator

Long Island has one of the densest health care employer markets in the country. Once you know ICD-10, CPT, and HCPCS, the doors open.

Looking for a Faster Path?

If you want billing without the full coding depth, Hunter also offers a 3-month Online Medical Billing Specialist program covering ICD-10, CPT, and HCPCS at a faster pace, designed for entry-level billing roles.

Take the Next Step

Medical billing and coding is one of the most stable, recession-resistant health care careers you can start without years of school. The U.S. Bureau of Labor Statistics projects 9% growth in the field through 2030, and Long Island employers are hiring now.

If you’re ready to learn the code sets that run American health care, request more information about Hunter’s Online Medical Billing and Coding program or call us today at the Levittown Campus or Medford Campus.

Frequently Asked Questions

What is the difference between ICD-10-CM and ICD-10-PCS?

ICD-10-CM is used for diagnosis coding in all health care settings. ICD-10-PCS is used only for inpatient hospital procedure coding. Most outpatient coders use ICD-10-CM and CPT. Hospital coders use both ICD-10 versions.

Do I need to know all three code sets to get a job?

Yes. Every entry-level medical billing and coding role expects working knowledge of ICD-10, CPT, and HCPCS. Hunter’s program covers all three, plus ICD-10-PCS for hospital settings.

How long does it take to learn medical billing and coding?

Â鶹´«Ã½¹ÙÍø’s Online Medical Billing and Coding program runs 5 months during the day or 10 months in the evening. Graduates are prepared to sit for the AAPC’s Certified Professional Coder (CPC) and Certified Professional Biller (CPB) exams.

Can I work from home as a medical biller and coder?

Remote work is common in this field, but rarely as your first job. Most employers want 1 to 3 years of in-office experience first, where you build speed, accuracy, and familiarity with the systems. Once you’ve proven yourself, remote becomes a real option.

What certifications should I pursue?

The two most recognized credentials are the Certified Professional Coder (CPC) and Certified Professional Biller (CPB), both offered through the American Academy of Professional Coders (AAPC). Hunter’s curriculum is built to prepare students for these exams.

A.I. Can Write the Code. Can You Read It?

There’s a gap opening up in the tech workforce right now, and it’s not between people who know tech and people who don’t. It’s between people who use A.I. tools and people who actually understand what those tools are producing.

Anyone can ask A.I. to generate a Python script or build out a component in JavaScript. The output looks clean. It usually runs. But when something breaks, or the logic is subtly wrong, or the architecture doesn’t scale, you need someone in the room who can actually read the code. Not just accept it.

That’s the gap. And right now, most people on the A.I. user side of it have no idea it exists.

The “Prompt and Paste” Problem

Here’s what’s happening across the industry: Developers who learned to rely entirely on A.I.-generated code are hitting a wall when things get complicated. They can produce, but they can’t debug. They can ship fast, but they can’t maintain. They’ve skipped the foundation, and it’s showing up.

A.I. tools like GitHub Copilot, Claude, and ChatGPT are genuinely powerful. They’re also wrong in ways that aren’t always obvious, especially to someone who doesn’t have a grounding in the logic underneath. Hallucinated functions. Deprecated syntax. Security gaps baked into boilerplate. If you can’t spot them, you’re shipping them.

The developers who are thriving right now aren’t the ones who use A.I. the most. They’re the ones who use A.I. as a multiplier on top of real skills. They know when to trust the output and, more importantly, when not to.

Foundations First Isn’t a Throwback. It’s a Strategy.

There’s a temptation to treat foundational coding knowledge as old-fashioned, like learning to drive a manual transmission when automatics exist. But that analogy breaks down fast when you’re building something that actually matters.

HTML, CSS, and JavaScript are still how the web works. Python is still the language underneath most of the A.I. tools people are talking about. Understanding how data flows through a backend, how a database query executes, and how a React component manages state are the literacy that makes A.I. genuinely useful rather than just fast.

Â鶹´«Ã½¹ÙÍø’s Web Application Design and Development program is built around this exact philosophy. The curriculum starts with the fundamentals because the fundamentals are what make everything else legible. HTML and CSS. JavaScript. Python. SQL. PHP. ReactJS. And yes, dedicated coursework on A.I. for web development, including how to integrate A.I. tools into real workflows without becoming dependent on them.

The sequence matters. By the time students are working with A.I.-based technologies, they’ve already built the foundation that lets them evaluate what those tools are doing.

What “A.I.-Ready” Actually Looks Like

When employers say they want developers who are “A.I.-ready,” they don’t mean people who know how to write a prompt. They mean people who can work alongside A.I. tools without being limited by them.

That looks like:

• Catching a hallucinated function before it makes it into production
• Debugging an error that A.I. generated but can’t explain
• Building architecture that A.I. can support but didn’t originate
• Knowing when a generated block of code is technically correct but practically wrong for the specific use case

These are judgment calls. They require context that comes only from actually understanding the language. No shortcut gets you there.

The Long Island Tech Opportunity

For people on Long Island looking to break into tech or accelerate a career change, the timing is real. Web development isn’t slowing down because of A.I. The Bureau of Labor Statistics projects 8% growth for web developer employment this decade. But the shape of the job is shifting toward people who can navigate A.I. tools critically, not just operationally.

Local employers—from Optimum to NYU Langone to the growing ecosystem of Long Island-based tech and digital marketing firms—are hiring graduates who arrive with both technical depth and practical, hands-on experience. Hunter’s 180-hour externship places students with companies across the region before graduation, so the transition from training to employment isn’t a leap. It’s a step.

Want to See the Program in Action?

Â鶹´«Ã½¹ÙÍø is hosting a virtual open house for the Web Application Design and Development program on Tuesday, May 12, 2026, at 6 p.m. It’s fully online, no commute required, and it’s the fastest way to get a real look at the curriculum, ask questions directly, and understand what the path forward looks like.

If you’ve been thinking about making a move into tech and wondering whether it still makes sense in an A.I.-heavy job market, this is a good place to start that conversation.

Learn more about the Web Application Design and Development program or .

Â鶹´«Ã½¹ÙÍø has campuses in Levittown and Medford on Long Island, N.Y. The Web Application Design and Development program is offered online with flexible scheduling options.