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ABA billing claim rejected vs denied explained: what each status means, the codes behind them and the exact fix for each so claims stop aging past 90 days.

ABA claims can still be denied after authorization. Learn how to compare authorization, coding, units, documentation and claims, then fix the issue through payment.

Can you bill ABA therapy after an authorization expires? Learn the denial codes, retro auth rules, reauthorization timeline and how to prevent ABA billing gaps.

Can CPT 97155 and 97153 be billed together? Concurrent ABA billing rules, payer policies by state, documentation standards and denial fixes for BCBAs.

Revenue codes in medical billing identify where services happened on UB-04 claims. See the 2026 list, types, real examples and common mistakes that cause denials.

Place of service codes in medical billing are two-digit numbers that tell insurance payers exactly where a healthcare service happened. They sit in Box 24B of the CMS-1500 claim form and in Loop 2400 (SV105) on the electronic 837P transaction. Get the code right and the payer processes your claim at the correct rate. Get it wrong and you're looking at a denial, an underpayment, or both. CMS (Centers for Medicare & Medicaid Services) maintains the full POS code set. The most r

The 10 most common medical claim denial reasons, the CARC code behind each one and the exact front-end fix that stops it from repeating.

Compare 6 ABA credentialing companies on scope, payer coverage and pricing model. Plus the BCBA credentialing process and how to get credentialed with BCBS.

Credentialed but claims still denying? Here's how ABA credentialing effective dates work, what CO-B7 means and how to fix the gap before it costs you.