John E. Greifenkamp, MD
Internal Medicine Physician · Longview, TX
John E. Greifenkamp, MD is an internal medicine physician with a practice address in Longview, Texas, and NPI 1396712980, issued on Mar 2, 2006. Check the license (Texas E0479, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.
- Name
- John E. Greifenkamp
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- E0479 TX
Self-reported in NPPES; status is on the state search - Practice location
- 707 Hollybrook Dr, Longview, TX 75605
- Phone
- (903) 757-6042
- Enumerated
- Mar 2, 2006
- Record last updated
- Jan 15, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (903) 232-8226
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 9,175 in Texas → Look up another NPI →
Also registered at 707 Hollybrook Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify John E. Greifenkamp in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license E0479Check 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 internal medicine physician in 2024
117 Medicare Part D claims for 40 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims.
Most prescribed
- Clopidogrel21 claims
- Carvedilol14 claims
- Amlodipine Besylate13 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.
Industry payments in 2024: $30.62
2 payments; by number, the most common kind was food and beverage; the largest payer was Boston Scientific Corporation. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
John E. Greifenkamp among 9,175 internal medicine physician records in Texas
John E. Greifenkamp, MD is one of 9,175 internal medicine physician records with a practice address in Texas. 82% 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 9% of them.
- NPI issued2006 · 9% of these records are older, 59% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileNo · 66% of these records are
- Record last updated2008 · 49% 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 Texas practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
99 internal medicine physician records list a practice address in Longview
They are 99 of the 2,066 NPPES records with a practice address in Longview, and 9,175 internal medicine physician records in Texas.
All 9,175 in Texas → Every provider in Longview → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Joseph Bell, MDLongview, TX 756051205803079
- Sita Devulapalli, M.D.Longview, TX 756051578558904
- Ifeanyi Elueze, MD PHDLongview, TX 756051396734802
- Roger Kiser, MDLongview, TX 756051154398840
- Kenneth McClure, MDLongview, TX 756051770550311
- Rekha Reddy, M.D.Longview, TX 756051285630558
- George Saikin, MDLongview, TX 756051316914831
- James Sawyer, M.D.Longview, TX 756051225005747
Common questions
What is John E. Greifenkamp, MD's NPI number?
John E. Greifenkamp, MD's National Provider Identifier (NPI) is 1396712980, issued on Mar 2, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John E. Greifenkamp, MD located?
The NPPES record lists a practice address at 707 Hollybrook Dr, Longview, TX, 75605. Phone: (903) 757-6042. Providers update this record themselves, so call before visiting.
How can I verify John E. Greifenkamp, MD's license?
NPPES lists Texas license number E0479, as entered by the provider. Search the Texas Medical Board at https://profile.tmb.state.tx.us/Search.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does John E. Greifenkamp, MD prescribe under Medicare Part D?
In 2024, John E. Greifenkamp, MD had 117 Medicare Part D claims for 40 beneficiaries; 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.