Harold S. Woo, DO
Emergency Medicine Physician · Walnut Creek, CA
Harold S. Woo, DO is an emergency medicine physician with a practice address in Walnut Creek, California, and NPI 1477627784, issued on Nov 20, 2006. Check the license (California 20A9500, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Harold S. Woo
- Credential
- DO
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- 20A9500 CA
Self-reported in NPPES; status is on the state search - Practice location
- 324 Conifer CT, Walnut Creek, CA 94598
- Phone
- (925) 708-2038
- Enumerated
- Nov 20, 2006
- Record last updated
- Nov 30, 2010 (not updated in 16 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Verify Harold S. Woo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A9500Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
11% more Medicare Part D claims than the average emergency medicine physician in 2024
250 Medicare Part D claims for 151 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. 13 claims were for opioids.
Most prescribed
- Ibuprofen72 claims
- Cephalexin20 claims
- Cyclobenzaprine Hcl19 claims
- Prednisone14 claims
- Dicyclomine Hcl13 claims
- Ondansetron Hcl13 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.
Harold S. Woo among 7,751 emergency medicine physician records in California
Harold S. Woo, DO is one of 7,751 emergency medicine physician records with a practice address in California. 81% 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 4% of them.
- NPI issued2006 · 4% of these records are older, 60% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 59% of these records are
- Record last updated2010 · 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 207P00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
95 emergency medicine physician records list a practice address in Walnut Creek
They are 95 of the 6,170 NPPES records with a practice address in Walnut Creek, and 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in Walnut Creek → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- David Birdsall, M.D.Walnut Creek, CA 945981164445615
- Daniel Buhler, M.D.Walnut Creek, CA 945981710908983
- Timothy Drazek, M.D.Walnut Creek, CA 945981336155795
- Paul Freitas, M.D.Walnut Creek, CA 945981558385641
- Alice Hunter, M.D.Walnut Creek, CA 945981023032125
- Malcolm Johnson, MDWalnut Creek, CA 945981003830316
- Andrew Kives, M.D.Walnut Creek, CA 945981972524007
- Theodore Kloth, M.D.Walnut Creek, CA 945981043234065
Common questions
What is Harold S. Woo, DO's NPI number?
Harold S. Woo, DO's National Provider Identifier (NPI) is 1477627784, issued on Nov 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Harold S. Woo, DO located?
The NPPES record lists a practice address at 324 Conifer CT, Walnut Creek, CA, 94598. Phone: (925) 708-2038. Providers update this record themselves, so call before visiting.
How can I verify Harold S. Woo, DO's license?
NPPES lists California license number 20A9500, 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 Harold S. Woo, DO prescribe under Medicare Part D?
In 2024, Harold S. Woo, DO had 250 Medicare Part D claims for 151 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.