Anna Waterstone, MD
NPI 1396241543 · Emergency Medicine Physician · Stanford, CA
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Anna Waterstone, MD is a Emergency Medicine Physician provider in Stanford, CA (NPI 1396241543).
Provider details
- NPI number
- 1396241543
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
8 yrs in NPPES registry
- Profile completeness28% of score
83% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
19 Medicare services, 2024 (ranked within specialty)
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 methodology.
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) |
|---|---|---|
| Emergency Department Visit With Moderate Level of Medical Decision Making99284 | 19 | $127 |
Typical Medicare-allowed amounts for these services range $127–$127 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote 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 · 8 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Ondansetronbrand: Ondansetron Odt | 24 | 23 |
| Oxycodone Hcl | 23 | 23 |
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 18 | 18 |
| Ibuprofen | 15 | 15 |
| Naproxen | 15 | 15 |
| Gabapentin | 14 | 14 |
| Prednisone | 13 | 13 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2018-04-04
- Last updated
- 2022-10-05
- Certified
- 2022-10-05
Frequently asked questions
- What is Anna Waterstone's NPI number?
- Anna Waterstone's National Provider Identifier (NPI) is 1396241543, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Anna Waterstone's specialty?
- Anna Waterstone is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Anna Waterstone located?
- Anna Waterstone's practice location on file with NPPES is 300 Pasteur Dr, Stanford, CA 94305-2200.
- What is Anna Waterstone's phone number?
- The practice phone number listed in the NPPES registry for Anna Waterstone is (650) 723-5111.
- Does Anna Waterstone accept Medicare?
- Anna Waterstone is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Anna Waterstone's NPI active?
- Yes — Anna Waterstone's NPI (1396241543) is active in the NPPES registry as of the last update on 2022-10-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.