Ryan Joo, M.D.
NPI 1639301922 · Infectious Disease Physician · Pasadena, CA
Enrolled with Medicare as Practitioner - Infectious Disease · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ryan Joo, M.D. is a Infectious Disease Physician provider in Pasadena, CA (NPI 1639301922).
Provider details
- NPI number
- 1639301922
- Entity type
- Individual
- Primary specialty
- Infectious Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A114398 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
16 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
1,551 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 726 | $122 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 626 | $81 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 126 | $179 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 45 | $98 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 28 | $139 |
Typical Medicare-allowed amounts for these services range $81–$179 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 21 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Ciprofloxacin Hcl | 57 | 17 |
| Bictegrav/Emtricit/Tenofov Alabrand: Biktarvy | 41 | — |
| Cephalexin | 35 | — |
| Vancomycin Hcl | 32 | — |
| Ertapenem Sodiumbrand: Ertapenem | 32 | 12 |
| Meropenem | 29 | — |
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 27 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$515 across 17 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2009-08-20
- Last updated
- 2023-11-01
- Certified
- 2023-10-31
Frequently asked questions
- What is Ryan Joo's NPI number?
- Ryan Joo's National Provider Identifier (NPI) is 1639301922, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ryan Joo's specialty?
- Ryan Joo is listed in the NPPES registry with a primary specialty of Infectious Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Ryan Joo located?
- Ryan Joo's practice location on file with NPPES is 960 E Green St Ste 105, Pasadena, CA 91106-2443.
- What is Ryan Joo's phone number?
- The practice phone number listed in the NPPES registry for Ryan Joo is (626) 304-0782.
- Does Ryan Joo accept Medicare?
- Ryan Joo is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ryan Joo's NPI active?
- Yes — Ryan Joo's NPI (1639301922) is active in the NPPES registry as of the last update on 2023-11-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.