Jennifer Margaret Klein, M.D.
Internal Medicine Physician · Hayward, CA
Jennifer Margaret Klein, M.D. is an internal medicine physician with a practice address in Hayward, California, and NPI 1861566184, issued on Nov 20, 2006. Check the license (California A85449, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Jennifer Margaret Klein
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A85449 CA
Self-reported in NPPES; status is on the state search - Practice location
- 27303 Sleepy Hollow Ave S, Hayward, CA 94545
- Phone
- (510) 454-1000
- Enumerated
- Nov 20, 2006
- Record last updated
- Dec 20, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 00A854490 CA
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 27303 Sleepy Hollow Ave S
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Jennifer Margaret Klein in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A85449Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
84% fewer Medicare Part D claims than the average internal medicine physician in 2024
507 Medicare Part D claims for 99 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 42% of claims.
Most prescribed
- Wixela Inhub54 claims
- Albuterol Sulfate Hfa47 claims
- Azelastine Hcl47 claims
- Fluticasone Propionate39 claims
- Ipratropium Bromide39 claims
- Flunisolide27 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.
Jennifer Margaret Klein among 17,696 internal medicine physician records in California
Jennifer Margaret Klein, M.D. is one of 17,696 internal medicine physician records with a practice address in California. 79% 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 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2021 · 61% 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 California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
40 internal medicine physician records list a practice address in Hayward
They are 40 of the 3,993 NPPES records with a practice address in Hayward, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Hayward → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- David Anderson, MDHayward, CA 945451659459410
- Abubakr Asadulla, M.D.Hayward, CA 945451881772648
- Yogesh Bhakta, MDHayward, CA 945451518045376
- Min-Shong Chang, MDHayward, CA 945451063479269
- Allen Chiu, MDHayward, CA 945451316025166
- Gerald Frank, MDHayward, CA 945451124106976
- Neil Handelman, MDHayward, CA 945451528146396
- Kaarel Kaljot, M.D.Hayward, CA 945451275578015
Common questions
What is Jennifer Margaret Klein, M.D.'s NPI number?
Jennifer Margaret Klein, M.D.'s National Provider Identifier (NPI) is 1861566184, issued on Nov 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Jennifer Margaret Klein, M.D. located?
The NPPES record lists a practice address at 27303 Sleepy Hollow Ave S, Hayward, CA, 94545. Phone: (510) 454-1000. Providers update this record themselves, so call before visiting.
How can I verify Jennifer Margaret Klein, M.D.'s license?
NPPES lists California license number A85449, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Jennifer Margaret Klein, M.D. prescribe under Medicare Part D?
In 2024, Jennifer Margaret Klein, M.D. had 507 Medicare Part D claims for 99 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.