Free provider profile
NATHAN JOHNSTON
NPI 1619232113
Individual
Psychiatry & Neurology, Psychiatry
Active registration
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Source: CMS NPPES registry, updated continuously. This record was last updated 2026-02-03.
23119 W INTERSTATE 10 BLDG 7, SAN ANTONIO, TX, 78257
210-994-6336
Single practice location
Enumerated 2012-07-10
- — Registration is active in NPPES.
- — Individual clinician record — reachable, but usually not the buyer.
- — Practice phone number is published.
- — Full street address on file for route planning.
- — 2 taxonomies listed — broader service mix.
- — Record updated within the last year.
Medicare Part D prescribing
Source: CMS Medicare Part D Prescribers by Provider, most recent public year.
Part D claims
354
Medicare patients
40
Part D drug cost
$175,772
Brand-name share
42.4%
of this prescriber's Part D claims
| Drug | Claims | Medicare cost |
|---|---|---|
| Spravato (Esketamine Hcl) | 134 | $162,207 |
| Trintellix (Vortioxetine Hydrobromide) | 15 | $6,616 |
| Doxepin Hcl (Doxepin Hcl) | 11 | $2,468 |
| Dextroamphetamine-Amphetamine (Dextroamphetamine/Amphetamine) | 27 | $732 |
| Bupropion Xl (Bupropion Hcl) | 13 | $310 |
| Clonazepam (Clonazepam) | 24 | $145 |
| Sertraline Hcl (Sertraline Hcl) | 18 | $142 |
| Lithium Carbonate Er (Lithium Carbonate) | 12 | $80 |
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Spravato (esketamine) Medicare billing
Source: CMS Medicare Part B fee-for-service, HCPCS G2082/G2083.
2024278 sessions · 22 patients · $248,019
2023326 sessions · 23 patients · $280,085
Full Spravato label-compliance detail — sessions per patient against the FDA label, risk flags and year-over-year trend.
- Registry data comes straight from CMS NPPES, which lists registration, not activity — a listed practice may have moved or closed.
- Part D covers Medicare prescription drug enrollees only. Commercial, Medicaid and cash-pay prescribing is not included, so these figures are a floor on real volume, not the whole picture.
- CMS publishes the Part D file annually, roughly two years behind the prescribing year. Drugs with 10 or fewer claims are suppressed.