Osteoarthritis denials at external review

• the question matters

  The outcome turns on which question was put to the reviewer: 90.9% on medical necessity (n=449) against 22.2% on experimental/investigational (n=54) — a gap of 69 points inside the same condition.

• rising

  It has risen over the published record: 42.1% in 2006 against 82.2% in 2025. What drove that is not in this data — the file holds outcomes, not who chose to appeal or how plans changed their own review.

• concentrated

  82% of these disputes involved pain management alone (n=410, 94.6% overturned), so the headline figure for osteoarthritis is largely that pairing.

• high volume

  With 503 decisions in 2021-2025, this is among the five most-disputed conditiones in the published record — one of the few where the numbers are stable enough to read year by year.

California requires each published decision to carry “a detailed case summary that includes the specific standards, criteria, and medical and scientific evidence, if any, that led to the case decision” (Health & Safety Code § 1374.33(h)(1)(K)). These are the elements our extraction found in this class, split by how the decision came out.

Read as description, not instruction. These are patterns in what reviewers wrote, not steps to follow, and no combination of them predicts an outcome. Only codes that cleared the validation gate appear — thirteen did not.

• FDA—11
• American College of Rheumatology—4
• American Academy of Orthopaedic Surgeons—2

A rate here is the outcome of decisions that named the authority, not the effect of naming it. Reviewers cite the standard they applied; the citation and the outcome share a cause.

• Pain Management94.6%410
• Orthopedic procedures21.6%37
• Pharmacy—15
• Electro, thermal & radiofrequency—10
• Durable medical equipment—9
• Diagnostic imaging & screening—8
• Special procedures—6
• Alternative treatment—3

Browse all treatment classes · Pick your own pair

• Viscosupp Injection97.9%381
• Other16.7%30
• Knee Replacement—15
• Steroid Injection—10
• Radiofreq Ablat—9
• Nerve Block—8
• Hip Replacement—6
• Arthritis Rx—5

• Medical Necessity90.9%449
• Experimental/Investigational22.2%54

Medical-necessity review asks whether the care is needed. Experimental/investigational review asks whether it is likely to be more beneficial than standard therapy — a harder statutory test, and the rates show it.