Medication Overuse Headache — When the Treatment Becomes the Problem
MOH develops when acute medications are used too frequently — documenting it strengthens any CGRP PA submission.
PA impact: This card directly affects prior authorization outcomes. Documentation language from this card can be used in PA letters and appeals.
What it is and why it matters for PA. Medication overuse headache (MOH) develops when patients use acute headache medications too frequently — the threshold is 10 or more days per month for triptans, ergotamines, and combination analgesics; 15 or more days per month for simple analgesics such as ibuprofen or acetaminophen. The ICD-10 code is G44.40 (drug-induced headache, not elsewhere classified) or its subtypes. MOH is both a clinical problem and a PA asset — documenting it strengthens the case for transitioning to preventive therapy.
How to identify it. Ask specifically about acute medication use frequency, not just which medications the patient takes. Patients rarely volunteer that they take pain medication 12 days a month — they're managing pain, not tracking a threshold. Triptans, NSAIDs, acetaminophen, butalbital compounds, and opioids all contribute. The question is: "How many days per month do you take something for a headache?" Document the answer as a frequency, not just a list of medications.
What withdrawal looks like and how to support it. The standard approach is abrupt discontinuation of the overused medication, which typically produces a withdrawal period of 7–10 days with worsening headache, nausea, and anxiety before improvement begins. Warn the patient explicitly — patients who aren't prepared for withdrawal abandon it. Bridge therapy options include a brief prednisone taper (60mg × 5 days, then taper), naproxen (500mg BID for 2–4 weeks as a non-overused alternative), or starting a CGRP preventive simultaneously — the CGRP mAbs are effective even in the presence of MOH and do not carry their own overuse risk.
Documenting MOH improves your CGRP PA. When MOH is present, note it with ICD-10 code G44.40 (drug-induced headache, unspecified) or the appropriate subtype, document that MOH evaluation has occurred, and record whether withdrawal has been initiated or completed. A CGRP preventive PA that shows chronic migraine plus MOH plus acute overuse pattern plus planned withdrawal with concurrent preventive initiation is substantially stronger than chronic migraine alone.
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Run a PA — free →Citations: ICHD-3 Section 8.2 (Medication-Overuse Headache) — ichd-3.org | AHS Consensus 2021 — Ailani J et al., Headache 2021;61(7):1021-1039. doi:10.1111/head.14153 | Diener HC et al., Lancet Neurology 2019;18(9):891-902.