Nancy Ngoc Giao Ly, MD, MPH
NPI 1598050205 · Occupational Medicine Physician · Walnut Creek, CA
Enrolled with Medicare as Practitioner - Preventive Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Nancy Ngoc Giao Ly, MD, MPH is a Occupational Medicine Physician provider in Walnut Creek, CA (NPI 1598050205).
Provider details
- NPI number
- 1598050205
- Entity type
- Individual
- Primary specialty
- Occupational Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD, MPH
- Sex
- Female
- Sole proprietor
- Yes
- License
- A153735 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
15 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 · 6 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 39 | 30 |
| Nirmatrelvir/Ritonavirbrand: Paxlovid | 22 | 22 |
| Azithromycin | 21 | 21 |
| Nitrofurantoin Monohyd/M-Crystbrand: Nitrofurantoin Mono-Macro | 20 | 20 |
| Prednisone | 12 | 12 |
| Ciprofloxacin Hcl | 11 | 11 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they include 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 , 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
- 2011-06-10
- Last updated
- 2022-02-11
Frequently asked questions
- What is Nancy Ngoc Giao Ly's NPI number?
- Nancy Ngoc Giao Ly's National Provider Identifier (NPI) is 1598050205, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Nancy Ngoc Giao Ly's specialty?
- Nancy Ngoc Giao Ly is listed in the NPPES registry with a primary specialty of Occupational Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Nancy Ngoc Giao Ly located?
- Nancy Ngoc Giao Ly's practice location on file with NPPES is 320 Lennon Ln Bldg 3, Walnut Creek, CA 94598.
- What is Nancy Ngoc Giao Ly's phone number?
- The practice phone number listed in the NPPES registry for Nancy Ngoc Giao Ly is (925) 206-2000.
- Does Nancy Ngoc Giao Ly accept Medicare?
- Nancy Ngoc Giao Ly is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Nancy Ngoc Giao Ly's NPI active?
- Yes — Nancy Ngoc Giao Ly's NPI (1598050205) is active in the NPPES registry as of the last update on 2022-02-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.