Ryan Hyun Wook Joo, M.D.
Infectious Disease Physician · Pasadena, CA
Ryan Hyun Wook Joo, M.D. is an infectious disease physician with a practice address in Pasadena, California, and NPI 1639301922, issued on Aug 20, 2009. Check the license (California A114398, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ryan Hyun Wook Joo
- Credential
- M.D.
- Primary taxonomy
- Infectious Disease Physician 207RI0200X
- License number
- A114398 CA
Self-reported in NPPES; status is on the state search - Practice location
- 960 E Green St Ste 105, Pasadena, CA 91106
- Phone
- (626) 304-0782
- Enumerated
- Aug 20, 2009
- Record last updated
- Nov 1, 2023
- Fax
- (626) 658-2848
- Medicare enrollment
- Enrolled (PECOS I20140621000035); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest infectious disease physician records → All 1,119 in California → Look up another NPI →
Also registered at 960 E Green St Ste 105
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Elisa Chang, M.D.Infectious Disease Physician1811284193
- David Delbello, M.D.Infectious Disease Physician1790988269
- Praneet Kalkat, MDInfectious Disease Physician1013440114
- Joseph Kim, M.D.Infectious Disease Physician1568623049
- Paul Nieberg, MDInfectious Disease Physician1902909187
Verify Ryan Hyun Wook Joo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A114398Check 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% fewer Medicare Part D claims than the average infectious disease physician in 2024
614 Medicare Part D claims for 105 beneficiaries, against an average of 689 among the 7,388 providers of this specialty who prescribed in Part D. Brand-name drugs were 29% of claims.
Most prescribed
- Ciprofloxacin Hcl57 claims
- Biktarvy41 claims
- Cephalexin35 claims
- Ertapenem32 claims
- Vancomycin Hcl32 claims
- Meropenem29 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: $515.13
17 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie 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.
Ryan Hyun Wook Joo among 1,119 infectious disease physician records in California
Ryan Hyun Wook Joo, M.D. 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 2009, is newer than 66% of them.
- NPI issued2009 · 66% of these records are older, 31% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2009 · median 2003 among the 735 with a school on file
- Record last updated2023 · 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 Pasadena → Infectious Disease Physician nationwide →
The 8 infectious disease physician records with the nearest ZIP codes
- Elisa Chang, M.D.Pasadena, CA 911061811284193
- David Delbello, M.D.Pasadena, CA 911061790988269
- Praneet Kalkat, MDPasadena, CA 911061013440114
- Arbi Khodadadi, M.D.Pasadena, CA 911061730271099
- Joseph Kim, M.D.Pasadena, CA 911061568623049
- Paul Nieberg, MDPasadena, CA 911061902909187
- Luong Ly, MDPasadena, CA 911051538101670
- David Man, MDPasadena, CA 911051366450637
Common questions
What is Ryan Hyun Wook Joo, M.D.'s NPI number?
Ryan Hyun Wook Joo, M.D.'s National Provider Identifier (NPI) is 1639301922, issued on Aug 20, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Ryan Hyun Wook Joo, M.D. located?
The NPPES record lists a practice address at 960 E Green St Ste 105, Pasadena, CA, 91106. Phone: (626) 304-0782. Providers update this record themselves, so call before visiting.
How can I verify Ryan Hyun Wook Joo, M.D.'s license?
NPPES lists California license number A114398, 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 Ryan Hyun Wook Joo, M.D. prescribe under Medicare Part D?
In 2024, Ryan Hyun Wook Joo, M.D. had 614 Medicare Part D claims for 105 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.