About Mark

Hi, I’m Mark.

I’m a Certified Professional Coder (CPC) and Certified Professional Biller (CPB) with 7+ years of hands-on experience in medical billing and revenue cycle management. I’ve spent my career where the money actually moves: reviewing charts, assigning CPT and ICD-10 codes, fighting denials, appealing claims, and building the workflows that keep practices profitable.

RCM.MedLifeGuide started because of a simple frustration: almost every medical billing resource online is either written by marketing teams who have never worked a denial, buried behind paywalls, or outdated the moment the new code set drops. Billers, coders, and practice owners deserve better. So I started writing it myself.

What this site is

A free, practical knowledge base covering the entire revenue cycle from eligibility and prior authorization to coding, claim submission, denials, and appeals. You’ll find:

  • 400+ pages of guides: CPT codes, ICD-10 codes, modifiers, place-of-service codes, denial codes, payer policies (Medicare, Medicaid, BCBS, Tricare, CHAMPVA, and more)
  • Working tools: BCBS prefix lookup, ICD-10 lookup, NPI registry, insurance phone directory, timely-filing-limit reference
  • Ready-to-use assets: claim appeal letter templates, denial resolution matrix, billing checklists
  • 2026–2027 updates: every guide is refreshed when CMS, AMA, or payers change the rules

How I keep it accurate

  1. Every guide is checked against the current code sets and official sources (CMS, AMA CPT, AAPC, federal register).
  2. When a rule changes, the guide gets updated not abandoned.
  3. I flag anything payer-specific as such, because one-size-fits-all billing advice is how claims get denied.
  4. My name and credentials are on every page. If I got something wrong, you can tell me directly.

My promise to you

If you work in medical billing whether you’re a new biller learning CPT for the first time, a coder staring at a CO-50 denial, or a practice owner trying to cut your denial rate this site is built for you. Free, accurate, practical, and current.

Got a topic I haven’t covered? Contact me info@medlifeguide.com and I’ll add it to the queue.

— Mark, CPC, CPB