Utilization of ICD-10-CM headache coding per provider type as shown in the black colored boxes.

Utilization of ICD-10-CM headache coding per provider type as shown in the black colored boxes.</p

Clinical visits stop codes assigned to primary care providers, neurologists, and physiatrists.

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Changes in headache coding across different sociodemographic groups.

Changes in headache coding across different sociodemographic groups.</p

Panel-A: Headache NOS coding.

Panel-B: Migraine headache coding. Panel-C: PTH headache coding in FY2016/2017. Abbreviations: Not-otherwise-specified (NOS); Trigeminal autonomic cephalalgia (TAC); Post-traumatic headache (PTH).</p

ICD-9-CM/ICD-10-CM diagnostic codes for headache crosswalk.

ICD-9-CM/ICD-10-CM diagnostic codes for headache crosswalk.</p

Probability modeled is ICD-10-CM headache NOS, migraine, and post-traumatic headache, with and without modeling specialist/generalist.

Probability modeled is ICD-10-CM headache NOS, migraine, and post-traumatic headache, with and without modeling specialist/generalist.</p

Specificity of ICD-10-CM headache coding among patients who were diagnosed with headache diagnosis of NOS, migraine, or PTH based on ICD-9-CM.

Specificity of ICD-10-CM headache coding among patients who were diagnosed with headache diagnosis of NOS, migraine, or PTH based on ICD-9-CM.</p

Distribution of patients based on number of headache diagnoses in ICD-10-CM.

Abbreviations: Not-otherwise-specified (NOS); International Classification of Diseases, 10th edition, Clinical Modification (ICD-10-CM); Headache Diagnoses (HD); Post-Traumatic Headache (PTH).</p