Kenneth W. Lien, MD
Allergy Physician · Castro Valley, CA
Kenneth W. Lien, MD is an allergy physician with a practice address in Castro Valley, California, and NPI 1396823092, issued on Nov 1, 2006. Check the license (California A72098, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Kenneth W. Lien
- Credential
- MD
- Primary taxonomy
- Allergy Physician 207KA0200X
- License number
- A72098 CA
Self-reported in NPPES; status is on the state search - Practice location
- 20400 Lake Chabot RD, Castro Valley, CA 94546
- Phone
- (510) 537-0700
- Enumerated
- Nov 1, 2006
- Record last updated
- Feb 3, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (510) 537-7795
- Medicaid ID
- 1396823092 CA
- Medicare enrollment
- Enrolled (PECOS I20070508000420); accepts Medicare assignment
- Medical or professional school
- University Of Chicago, Pritzker School Of Medicine, 1998
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest allergy physician records → All 157 in California → Look up another NPI →
Also registered at 20400 Lake Chabot RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Shalini Jeyakumar, MPA, RPA-CPhysician Assistant1801119995
- Susan Karplus, N.P.Family Nurse Practitioner1184878654
Verify Kenneth W. Lien in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A72098Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
41% more Medicare Part D claims than the average allergy physician in 2024
1,059 Medicare Part D claims for 163 beneficiaries, against an average of 750 among the 645 providers of this specialty who prescribed in Part D. Brand-name drugs were 37% of claims.
Most prescribed
- Fluticasone Propionate104 claims
- Montelukast Sodium84 claims
- Albuterol Sulfate Hfa83 claims
- Azelastine Hcl63 claims
- Levocetirizine Dihydrochloride57 claims
- Dupixent Syringe55 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: $1,375.77
47 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. The 502 providers of this specialty with any payment received $9,080.33 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.
Kenneth W. Lien among 157 allergy physician records in California
Kenneth W. Lien, MD is one of 157 allergy physician records with a practice address in California. 69% 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, 31% newer
- In a Medicare fileYes · 69% of these records are
- In the CMS Doctors and Clinicians fileYes · 52% of these records are
- Graduated1998 · median 1992 among the 82 with a school on file
- Record last updated2014 · 70% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207KA0200X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Allergy Physician providers in California
There are 157 allergy physician records in California.
All 157 in California → Every provider in Castro Valley → Allergy Physician nationwide →
The 8 allergy physician records with the nearest ZIP codes
- Rao Kosaraju, MDFremont, CA 945381528012325
- Michael Lenoir, MDFremont, CA 945381023065760
- Dionisio Fernandes, MDSan Leandro, CA 945781285691121
- Valerie Jerdee, M.D.Brentwood, CA 945131134145394
- Candace Katz, M.D.Pleasanton, CA 945881477551505
- Shilpi Anand, M.D.Walnut Creek, CA 945981871556605
- Kelsey Ige, MDWalnut Creek, CA 945981013414135
- Joshua Jacobs, MDWalnut Creek, CA 945981215920673
Common questions
What is Kenneth W. Lien, MD's NPI number?
Kenneth W. Lien, MD's National Provider Identifier (NPI) is 1396823092, issued on Nov 1, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Kenneth W. Lien, MD located?
The NPPES record lists a practice address at 20400 Lake Chabot RD, Castro Valley, CA, 94546. Phone: (510) 537-0700. Providers update this record themselves, so call before visiting.
How can I verify Kenneth W. Lien, MD's license?
NPPES lists California license number A72098, 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 Kenneth W. Lien, MD prescribe under Medicare Part D?
In 2024, Kenneth W. Lien, MD had 1,059 Medicare Part D claims for 163 beneficiaries; the average among allergy physician prescribers was 750. 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.