Kathryn Middleton, DO
NPI 1417539503 · Family Medicine Physician · Menlo Park, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Kathryn Middleton, DO is a Family Medicine Physician provider in Menlo Park, CA (NPI 1417539503).
Provider details
- NPI number
- 1417539503
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Female
- Sole proprietor
- No
- License
- 24393 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
5 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
141 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 73 | $77 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 33 | $112 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 19 | $169 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 16 | $116 |
Typical Medicare-allowed amounts for these services range $77–$169 (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 · 20 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 74 | 25 |
| Levothyroxine Sodium | 40 | 13 |
| Lisinopril | 37 | 12 |
| Losartan Potassium | 27 | — |
| Alendronate Sodium | 22 | — |
| Metformin Hcl | 20 | — |
| Furosemide | 20 | — |
Practice location
Mailing address
Additional practice locations (2)
- 394 Harrison AveBoston, MA 02118-2212Phone: (888) 663-6331Fax: (415) 252-7176
- 333 Borthwick AvePortsmouth, NH 03801-7128Phone: (603) 559-4129
Registry dates
- Enumerated
- 2021-04-27
- Last updated
- 2025-10-17
- Certified
- 2025-10-17
Frequently asked questions
- What is Kathryn Middleton's NPI number?
- Kathryn Middleton's National Provider Identifier (NPI) is 1417539503, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Kathryn Middleton's specialty?
- Kathryn Middleton is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Kathryn Middleton located?
- Kathryn Middleton's practice location on file with NPPES is 325 Sharon Park Dr Ste F3, Menlo Park, CA 94025-6848.
- What is Kathryn Middleton's phone number?
- The practice phone number listed in the NPPES registry for Kathryn Middleton is (888) 663-6331.
- Does Kathryn Middleton accept Medicare?
- Kathryn Middleton is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Kathryn Middleton's NPI active?
- Yes — Kathryn Middleton's NPI (1417539503) is active in the NPPES registry as of the last update on 2025-10-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.