Roy Hyunchang Yoo, D.M.D.
Periodontics · Cypress, CA
Roy Hyunchang Yoo, D.M.D. is a periodontics with a practice address in Cypress, California, and NPI 1205018918, issued on Dec 4, 2007. Check the license (California 53303, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Roy Hyunchang Yoo
- Credential
- D.M.D.
- Primary taxonomy
- Periodontics 1223P0300X
- License number
- 53303 CA
Self-reported in NPPES; status is on the state search - Practice location
- 9242 Walker St Ste C, Cypress, CA 90630
- Phone
- (714) 220-2003
- Enumerated
- Dec 4, 2007
- Record last updated
- Jan 10, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (714) 220-2004
- Entity
- Type 1 · individual
8 nearest periodontics records → All 929 in California → Look up another NPI →
Verify Roy Hyunchang Yoo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 53303Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
24% more Medicare Part D claims than the average periodontics in 2024
343 Medicare Part D claims for 107 beneficiaries, against an average of 277 among the 4,191 providers of this specialty who prescribed in Part D. 12 claims were for opioids.
Most prescribed
- Amoxicillin139 claims
- Ibuprofen94 claims
- Chlorhexidine Gluconate52 claims
- Clindamycin Hcl19 claims
- Amoxicillin-Clavulanate Potass12 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.
Roy Hyunchang Yoo among 929 periodontics records in California
Roy Hyunchang Yoo, D.M.D. is one of 929 periodontics 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 2007, is newer than 29% of them.
- NPI issued2007 · 29% of these records are older, 40% newer
- In a Medicare fileYes · 69% of these records are
- In the CMS Doctors and Clinicians fileNo · under 1% of these records are
- Record last updated2014 · 78% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 1223P0300X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Periodontics providers in California
There are 929 periodontics records in California.
All 929 in California → Every provider in Cypress → Periodontics nationwide →
The 8 periodontics records with the nearest ZIP codes
- Rudolph Gamarnik, DDSCypress, CA 906301730297888
- Ramtin Khaef, DMDCypress, CA 906301558596395
- Alex Pezeshkian, DMDCypress, CA 906301538332028
- Donald PhamCypress, CA 906301649877994
- Gilbert Barajas, D.D.S.Montebello, CA 906401619077310
- Hector Carmona, DDSMontebello, CA 906401063935534
- Anat Tadir, DMDNorwalk, CA 906501043594328
- James Cheng, DDSWhittier, CA 906061497682306
Common questions
What is Roy Hyunchang Yoo, D.M.D.'s NPI number?
Roy Hyunchang Yoo, D.M.D.'s National Provider Identifier (NPI) is 1205018918, issued on Dec 4, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Roy Hyunchang Yoo, D.M.D. located?
The NPPES record lists a practice address at 9242 Walker St Ste C, Cypress, CA, 90630. Phone: (714) 220-2003. Providers update this record themselves, so call before visiting.
How can I verify Roy Hyunchang Yoo, D.M.D.'s license?
NPPES lists California license number 53303, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Roy Hyunchang Yoo, D.M.D. prescribe under Medicare Part D?
In 2024, Roy Hyunchang Yoo, D.M.D. had 343 Medicare Part D claims for 107 beneficiaries; the average among periodontics prescribers was 277. 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.