Harkiran K. Grewal, MD
Infectious Disease Physician · Castro Valley, CA
Harkiran K. Grewal, MD is an infectious disease physician with a practice address in Castro Valley, California, and NPI 1790022416, issued on Jan 15, 2013. Check the license (California A135633, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Harkiran K. Grewal
- Credential
- MD
- Primary taxonomy
- Infectious Disease Physician 207RI0200X
- License numbers
- A135633 CA
MD044631 DC
Self-reported in NPPES; status is on the state search - Practice location
- 20400 Lake Chabot RD Ste 102, Castro Valley, CA 94546
- Phone
- (202) 444-0086
- Enumerated
- Jan 15, 2013
- Record last updated
- Jul 21, 2022
- Entity
- Type 1 · individual
8 nearest infectious disease physician records → All 1,119 in California → Look up another NPI →
Also registered at 20400 Lake Chabot RD Ste 102
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Suguna Chirla, M.DHematology & Oncology Physician1124105176
- Heather KurzNurse Practitioner1619515830
Verify Harkiran K. Grewal in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A135633Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
56% fewer Medicare Part D claims than the average infectious disease physician in 2024
303 Medicare Part D claims for 65 beneficiaries, against an average of 689 among the 7,388 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims.
Most prescribed
- Cephalexin40 claims
- Levofloxacin24 claims
- Cefdinir21 claims
- Doxycycline Hyclate21 claims
- Ceftriaxone17 claims
- Nitrofurantoin Mono-Macro17 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: $327.60
13 payments; by number, the most common kind was food and beverage; the largest payer was Shionogi Inc. The 3,895 providers of this specialty with any payment received $4,362.19 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.
Harkiran K. Grewal among 1,119 infectious disease physician records in California
Harkiran K. Grewal, MD is one of 1,119 infectious disease 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 2013, is newer than 77% of them.
- NPI issued2013 · 77% of these records are older, 20% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 66% of these records are
- Record last updated2022 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RI0200X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Infectious Disease Physician providers in California
There are 1,119 infectious disease physician records in California.
All 1,119 in California → Every provider in Castro Valley → Infectious Disease Physician nationwide →
The 8 infectious disease physician records with the nearest ZIP codes
- Steven Oppenheimer, MDCastro Valley, CA 945461962435396
- Mark Finch, M.D.Hayward, CA 945451730248196
- Daniel Klein, MDHayward, CA 945451245318096
- Michael Ascher, M.D.Lafayette, CA 945491033427505
- James Pennington, M.D.Lafayette, CA 945491184962144
- Loretta Obrien, MDLivermore, CA 945501750379657
- Thuy-Trang Dang, MDMartinez, CA 945531407871478
- Shobha Sharma, DOMartinez, CA 945531326118290
Common questions
What is Harkiran K. Grewal, MD's NPI number?
Harkiran K. Grewal, MD's National Provider Identifier (NPI) is 1790022416, issued on Jan 15, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Harkiran K. Grewal, MD located?
The NPPES record lists a practice address at 20400 Lake Chabot RD Ste 102, Castro Valley, CA, 94546. Phone: (202) 444-0086. Providers update this record themselves, so call before visiting.
How can I verify Harkiran K. Grewal, MD's license?
NPPES lists California license number A135633, 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 Harkiran K. Grewal, MD prescribe under Medicare Part D?
In 2024, Harkiran K. Grewal, MD had 303 Medicare Part D claims for 65 beneficiaries; the average among infectious disease physician prescribers was 689. 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.