William Arthur Seiffert, MD
Internal Medicine Physician · Las Cruces, NM
William Arthur Seiffert, MD is an internal medicine physician with a practice address in Las Cruces, New Mexico, and NPI 1669563284, issued on Sep 27, 2006. Check the license (New Mexico MD2009-0068, as entered in NPPES) on the New Mexico Medical Board; the Medicare figures below come from public CMS files.
- Name
- William Arthur Seiffert
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- MD2009-0068 NM
Self-reported in NPPES; status is on the state search - Practice location
- 4311 E Lohman Ave, Las Cruces, NM 88011
- Phone
- (575) 556-6625
- Enumerated
- Sep 27, 2006
- Record last updated
- May 11, 2017 (not updated in 9 years: call before relying on the address or phone)
- Fax
- (575) 556-7495
- Medicaid ID
- 75182262 NM
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 770 in New Mexico → Look up another NPI →
Also registered at 4311 E Lohman Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify William Arthur Seiffert in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNew Mexico Medical Board
Search for license MD2009-0068Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average internal medicine physician in 2024
35 Medicare Part D claims, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
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 Arthur Seiffert among 770 internal medicine physician records in New Mexico
William Arthur Seiffert, MD is one of 770 internal medicine physician records with a practice address in New Mexico. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 57% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileNo · 58% of these records are
- Record last updated2017 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a New Mexico practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
52 internal medicine physician records list a practice address in Las Cruces
They are 52 of the 5,468 NPPES records with a practice address in Las Cruces, and 770 internal medicine physician records in New Mexico.
All 770 in New Mexico → Every provider in Las Cruces → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Francis Attiogbe, M.D.Las Cruces, NM 880111457346652
- Harry BassLas Cruces, NM 880111952398364
- Michael Bell, M.D.Las Cruces, NM 880111851397723
- Louis Benevento, MDLas Cruces, NM 880111063445666
- Angelica Caglia, MDLas Cruces, NM 880111861486201
- Virginia Corpus, MD, FACPLas Cruces, NM 880111144225160
- John Glick, M.D.Las Cruces, NM 880111811904337
- Ernest JabourLas Cruces, NM 880111306815691
Common questions
What is William Arthur Seiffert, MD's NPI number?
William Arthur Seiffert, MD's National Provider Identifier (NPI) is 1669563284, issued on Sep 27, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William Arthur Seiffert, MD located?
The NPPES record lists a practice address at 4311 E Lohman Ave, Las Cruces, NM, 88011. Phone: (575) 556-6625. Providers update this record themselves, so call before visiting.
How can I verify William Arthur Seiffert, MD's license?
NPPES lists New Mexico license number MD2009-0068, as entered by the provider. Search the New Mexico Medical Board at https://www.nmmb.state.nm.us/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William Arthur Seiffert, MD prescribe under Medicare Part D?
In 2024, William Arthur Seiffert, MD had 35 Medicare Part D claims; the average among internal medicine physician prescribers was 3,176. 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.