William Zachary Poston, DO
Emergency Medicine Physician · Columbia, SC
William Zachary Poston, DO is an emergency medicine physician with a practice address in Columbia, South Carolina, and NPI 1497370308, issued on Jun 16, 2020. Check the license (South Carolina LL83245, as entered in NPPES) on the South Carolina Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- William Zachary Poston
- Credential
- DO
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- LL83245 SC
Self-reported in NPPES; status is on the state search - Practice location
- Emergency Medicine, Columbia, SC 29203
- Phone
- (803) 434-3790
- Enumerated
- Jun 16, 2020
- Record last updated
- Jun 16, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (803) 434-6299
- Medicare enrollment
- Enrolled (PECOS I20230831004571); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 1,244 in South Carolina → Look up another NPI →
Also registered at Emergency Medicine
A shared address usually means a shared clinic or building; it does not show who employs whom.
- William Fraser, MDEmergency Medicine Physician1013533280
- Connor Glair, MDEmergency Medicine Physician1447877394
- Sean Grumbach, MDEmergency Medicine Physician1265057178
- Nicolas Osborne, MDEmergency Medicine Physician1245855154
- Anders Oster, MDEmergency Medicine Physician1871119990
- Christopher Poggi, MDEmergency Medicine Physician1366067274
Verify William Zachary Poston in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersSouth Carolina Board of Medical Examiners
Search for license LL83245Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
1% fewer Medicare Part D claims than the average emergency medicine physician in 2024
223 Medicare Part D claims for 148 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. 24 claims were for opioids.
Most prescribed
- Doxycycline Hyclate19 claims
- Ondansetron Odt19 claims
- Cephalexin17 claims
- Hydrocodone-Acetaminophen17 claims
- Ibuprofen17 claims
- Cefpodoxime Proxetil14 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Wake Forest Emergency ProvidersCharlotte, NC
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William Zachary Poston among 1,244 emergency medicine physician records in South Carolina
William Zachary Poston, DO is one of 1,244 emergency medicine physician records with a practice address in South Carolina. 84% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 79% of them.
- NPI issued2020 · 79% of these records are older, 17% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2020 · median 2012 among the 752 with a school on file
- Record last updated2020 · 51% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a South Carolina practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
219 emergency medicine physician records list a practice address in Columbia
They are 219 of the 11,200 NPPES records with a practice address in Columbia, and 1,244 emergency medicine physician records in South Carolina.
All 1,244 in South Carolina → Every provider in Columbia → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Francis Clarkson, M.DColumbia, SC 292031639168180
- Thomas Cook, MDColumbia, SC 292031598736282
- David Ford, MDColumbia, SC 292031528039385
- William Gerard, MDColumbia, SC 292031326019191
- Gary Hals, MDColumbia, SC 292031780655456
- Patrick Hunt, MDColumbia, SC 292031265403026
- Terrance McHugh, MDColumbia, SC 292031598736340
- Daniel Noltkamper, MDColumbia, SC 292031942292115
Common questions
What is William Zachary Poston, DO's NPI number?
William Zachary Poston, DO's National Provider Identifier (NPI) is 1497370308, issued on Jun 16, 2020. An NPI identifies a provider in billing; it is not a license.
Where is William Zachary Poston, DO located?
The NPPES record lists a practice address at Emergency Medicine, Columbia, SC, 29203. Phone: (803) 434-3790. Providers update this record themselves, so call before visiting.
How can I verify William Zachary Poston, DO's license?
NPPES lists South Carolina license number LL83245, as entered by the provider. Search the South Carolina Board of Medical Examiners at https://verify.llronline.com/LicLookup/Med/Med.aspx?div=22. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William Zachary Poston, DO prescribe under Medicare Part D?
In 2024, William Zachary Poston, DO had 223 Medicare Part D claims for 148 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.