Joan Ryoo, MD, MSHS
NPI 1699854596 · Therapeutic Radiology Physician · Los Angeles, CA
Enrolled with Medicare as Practitioner - Radiation Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Joan Ryoo, MD, MSHS is a Therapeutic Radiology Physician provider in Los Angeles, CA (NPI 1699854596).
Provider details
- NPI number
- 1699854596
- Entity type
- Individual
- Primary specialty
- Therapeutic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD, MSHS
- Sex
- Female
- Sole proprietor
- No
- License
- 221442 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 5 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Tamsulosin Hcl | 36 | 12 |
| Hydrocortisone | 25 | 15 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 21 | — |
| Silver Sulfadiazinebrand: Ssd | 17 | 14 |
| Silver Sulfadiazine | 12 | 11 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-03
- Last updated
- 2021-12-01
Frequently asked questions
- What is Joan Ryoo's NPI number?
- Joan Ryoo's National Provider Identifier (NPI) is 1699854596, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Joan Ryoo's specialty?
- Joan Ryoo is listed in the NPPES registry with a primary specialty of Therapeutic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is Joan Ryoo located?
- Joan Ryoo's practice location on file with NPPES is 4950 W Sunset Blvd, Los Angeles, CA 90027-5822.
- What is Joan Ryoo's phone number?
- The practice phone number listed in the NPPES registry for Joan Ryoo is (323) 783-2841.
- Does Joan Ryoo accept Medicare?
- Joan Ryoo is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Joan Ryoo's NPI active?
- Yes — Joan Ryoo's NPI (1699854596) is active in the NPPES registry as of the last update on 2021-12-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.