Har Hiu Dawn Lam, M.D.
Specialist · Union City, CA
Har Hiu Dawn Lam, M.D. is a specialist with a practice address in Union City, California, and NPI 1124190459, issued on Nov 14, 2006. Check the license (California A86193, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Har Hiu Dawn Lam
- Credential
- M.D.
- Primary taxonomy
- Specialist 174400000X
- License number
- A86193 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3553 Whipple RD, Union City, CA 94587
- Phone
- (510) 454-1000
- Enumerated
- Nov 14, 2006
- Record last updated
- Dec 22, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20070403000542); accepts Medicare assignment
- Medical or professional school
- Stanford University School Of Medicine, 2002
- Entity
- Type 1 · individual
8 nearest specialist records → All 5,749 in California → Look up another NPI →
Also registered at 3553 Whipple RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Har Hiu Dawn Lam in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license A86193Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
44% fewer Medicare Part D claims than the average specialist in 2024
766 Medicare Part D claims for 158 beneficiaries, against an average of 1,380 among the 8,233 providers of this specialty who prescribed in Part D. Brand-name drugs were 17% of claims.
Most prescribed
- Dorzolamide-Timolol133 claims
- Diclofenac Sodium127 claims
- Prednisolone Acetate114 claims
- Latanoprost106 claims
- Moxifloxacin61 claims
- Bromfenac Sodium59 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
- Permanente Medical Group IncSan Leandro, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Har Hiu Dawn Lam among 5,749 specialist records in California
Har Hiu Dawn Lam, 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 2006, is newer than 7% of them.
- NPI issued2006 · 7% of these records are older, 60% newer
- In a Medicare fileYes · 30% of these records are
- In the CMS Doctors and Clinicians fileYes · 19% of these records are
- Graduated2002 · median 1989 among the 1,075 with a school on file
- Record last updated2021 · 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 Union City → Specialist nationwide →
The 8 specialist records with the nearest ZIP codes
- Monica GuillenUnion City, CA 945871932921244
- Agnes LoUnion City, CA 945871013139831
- Aubrey MartinezUnion City, CA 945871750268199
- Thao Phan, M.D.Union City, CA 945871306849807
- Lani UemuraUnion City, CA 945871104948686
- Marion Anthony, M.D.Pleasanton, CA 945881679577563
- Young Kang, MDPleasanton, CA 945881720050529
- Stephen Nares, MA, PPSCPleasanton, CA 945881497060412
Common questions
What is Har Hiu Dawn Lam, M.D.'s NPI number?
Har Hiu Dawn Lam, M.D.'s National Provider Identifier (NPI) is 1124190459, issued on Nov 14, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Har Hiu Dawn Lam, M.D. located?
The NPPES record lists a practice address at 3553 Whipple RD, Union City, CA, 94587. Phone: (510) 454-1000. Providers update this record themselves, so call before visiting.
How can I verify Har Hiu Dawn Lam, M.D.'s license?
NPPES lists California license number A86193, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Har Hiu Dawn Lam, M.D. prescribe under Medicare Part D?
In 2024, Har Hiu Dawn Lam, M.D. had 766 Medicare Part D claims for 158 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.