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Edit this profileAt a glance
- 20400 Lake Chabot Rd, Ste. 304, Castro Valley, CA 94546
About Dr. Lien
Based in Castro Valley, CA, Kenneth W. Lien, MD is listed in the NPI registry under allergy. Kenneth graduated from University of Chicago, Pritzker School of Medicine in 1998. According to Medicare claims data, Kenneth cared for 407 Medicare patients across 6,716 services. The services billed most often include test for allergy using allergenic extract, test for allergy using skin patch, and established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more. NPI 1396823092 identifies this record in the national registry.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (510) 537-0700
- Email not available
Practice Locations
20400 LAKE CHABOT RD STE. 304
Castro Valley, CA 94546
Procedures Most Often Billed to Medicare
6,716 services · 407 patients · 7 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Test for allergy using allergenic extract | Treatment | 95004 |
4,642 | More often than most peers in Allergy |
| Test for allergy using skin patch | Treatment | 95044 |
1,540 | More often than most peers in Allergy |
| Test to measure expiratory airflow and volume | Treatment | 94010 |
153 | More often than most peers in Allergy |
| Test to measure expiratory airflow and volume changes before and after medication administration | Treatment | 94060 |
32 | More often than most peers in Allergy |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
272 | More than most peers in Allergy |
| New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more | Office visit | 99204 |
52 | More often than most peers in Allergy |
| New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more | Office visit | 99203 |
25 | As often as other peers in Allergy |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Trained at University of Chicago, Pritzker School of Medicine 2
Other providers in the same specialty who trained at the same institution.
Class of 1998 at University of Chicago, Pritzker School of Medicine 8
Providers who graduated from the same medical school in the same year.
More connections — 8 related providers in 1 group
Also performs Test for allergy using allergenic extract 8
Providers in CA who bill this service to Medicare most often.
Common questions
What does Dr. Lien specialize in?
Dr. Lien is an allergy in Castro Valley, CA. That is the designation recorded for this NPI in the federal registry.
NPI registry
Where is Dr. Lien located?
Dr. Lien is listed at 20400 Lake Chabot Rd Ste. 304, Castro Valley, CA 94546. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Dr. Lien's phone number?
The number on file is (510) 537-0700. Contact the office directly to confirm availability and scheduling.
NPI registry
What is Dr. Lien's NPI number?
Dr. Lien's National Provider Identifier is 1396823092. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. Lien go to medical school?
Dr. Lien attended University of Chicago, Pritzker School of Medicine, graduating in 1998. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Lien been practicing?
Dr. Lien has 28 years experience. Calculated from a graduation year of 1998, reported in the CMS National Downloadable File.
CMS public data
What does Dr. Lien do most often?
According to Medicare billing data, Dr. Lien provides treatments such as test for allergy using allergenic extract and test for allergy using skin patch, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Lien confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Lien. If this is you, claiming it is free.
Guide.md
Guide.md listings do not constitute medical advice or an endorsement.