Simon Humphries, MD
NPI 1023149440 · Internal Medicine Physician · Los Altos, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Simon Humphries, MD is a Internal Medicine Physician provider in Los Altos, CA (NPI 1023149440).
Provider details
- NPI number
- 1023149440
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- G067109 (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
19 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
1,801 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 780 | $146 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 141 | $17 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 114 | $84 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 108 | $105 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 100 | $149 |
| Destruction of Precancer Skin Growth, 15 Or More Growths17004 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 66 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 175 | 47 |
| Trazodone Hcl | 119 | 32 |
| Levothyroxine Sodium | 88 | 24 |
| Tamsulosin Hcl | 87 | 20 |
| Divalproex Sodium | 68 | 11 |
| Lisinopril | 67 | 20 |
| Amlodipine Besylate | 63 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$252 across 12 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
- 2007-03-08
- Last updated
- 2010-07-30
Frequently asked questions
- What is Simon Humphries's NPI number?
- Simon Humphries's National Provider Identifier (NPI) is 1023149440, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Simon Humphries's specialty?
- Simon Humphries is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Simon Humphries located?
- Simon Humphries's practice location on file with NPPES is 811 Altos Oaks Dr, Los Altos, CA 94024-5426.
- What is Simon Humphries's phone number?
- The practice phone number listed in the NPPES registry for Simon Humphries is (650) 917-6920.
- Does Simon Humphries accept Medicare?
- Simon Humphries is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Simon Humphries's NPI active?
- Yes — Simon Humphries's NPI (1023149440) is active in the NPPES registry as of the last update on 2010-07-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.