William Talbert Chapman, M.D.
Specialist · National City, CA
William Talbert Chapman, M.D. is a specialist with a practice address in National City, California, and NPI 1164558920, issued on Feb 26, 2007. Check the license (California G38997, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- William Talbert Chapman
- Credential
- M.D.
- Primary taxonomy
- Specialist 174400000X
- License number
- G38997 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2340 E 8TH St, National City, CA 91950
- Phone
- (619) 475-3870
- Enumerated
- Feb 26, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (619) 475-6402
- Medicaid ID
- 00G389970 CA
- Entity
- Type 1 · individual
8 nearest specialist records → All 5,749 in California → Look up another NPI →
Also registered at 2340 E 8TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Teresa CostelloAddiction (Substance Use Disorder) Counselor1396384566
- Enrique PatinoAddiction (Substance Use Disorder) Counselor1184263444
- Charles ScrivensAddiction (Substance Use Disorder) Counselor1922647288
- Henry Shin, DPMPodiatrist1780775379
- Irineo Tiangco, M.D.Internal Medicine Physician1245322213
Verify William Talbert Chapman in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license G38997Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average specialist in 2024
53 Medicare Part D claims for 22 beneficiaries, against an average of 1,380 among the 8,233 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of 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.
William Talbert Chapman among 5,749 specialist records in California
William Talbert Chapman, M.D. is one of 5,749 specialist records with a practice address in California. 30% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 40% of them.
- NPI issued2007 · 40% of these records are older, 44% newer
- In a Medicare fileYes · 30% of these records are
- In the CMS Doctors and Clinicians fileNo · 19% of these records are
- Record last updated2007 · 77% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 174400000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Specialist providers in California
There are 5,749 specialist records in California.
All 5,749 in California → Every provider in National City → Specialist nationwide →
The 8 specialist records with the nearest ZIP codes
- Raynaldo NatividadLemon Grove, CA 919451013092972
- Anthony NavarroLemon Grove, CA 919451578648440
- Bennelle ReeseLemon Grove, CA 919451487739363
- Neal TorresLemon Grove, CA 919451972649754
- Scott Hacker, M.D.La Mesa, CA 919421750450805
- Aisha Lope De Haro-SallehLa Mesa, CA 919421952026932
- Jack Madowitz, M.D.La Mesa, CA 919421578581971
- Mearl Naponic, M.D.La Mesa, CA 919421578679304
Common questions
What is William Talbert Chapman, M.D.'s NPI number?
William Talbert Chapman, M.D.'s National Provider Identifier (NPI) is 1164558920, issued on Feb 26, 2007. An NPI identifies a provider in billing; it is not a license.
Where is William Talbert Chapman, M.D. located?
The NPPES record lists a practice address at 2340 E 8TH St, National City, CA, 91950. Phone: (619) 475-3870. Providers update this record themselves, so call before visiting.
How can I verify William Talbert Chapman, M.D.'s license?
NPPES lists California license number G38997, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does William Talbert Chapman, M.D. prescribe under Medicare Part D?
In 2024, William Talbert Chapman, M.D. had 53 Medicare Part D claims for 22 beneficiaries; the average among specialist prescribers was 1,380. 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.