Andrew Johnston, MD
NPI 1710931019 · Internal Medicine Physician · Carmel, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Andrew Johnston, MD is a Internal Medicine Physician provider in Carmel, CA (NPI 1710931019).
Provider details
- NPI number
- 1710931019
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 25495 (AZ)
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 tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
71 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) |
|---|---|---|
| Hemoglobin A1c Level83036 | 37 | $10 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Tracing93005 | 34 | $7 |
Typical Medicare-allowed amounts for these services range $7–$10 (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 · 156 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 742 | 210 |
| Amlodipine Besylate | 435 | 122 |
| Losartan Potassium | 366 | 100 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 363 | 50 |
| Levothyroxine Sodium | 293 | 79 |
| Pregabalin | 251 | 36 |
Practice location
Mailing address
Additional practice locations (1)
- 3750 Rohnerville RoadFortuna, CA 95540Phone: (707) 725-4477Fax: (707) 725-2978
Registry dates
- Enumerated
- 2006-05-20
- Last updated
- 2020-10-30
- Certified
- 2020-10-29
Frequently asked questions
- What is Andrew Johnston's NPI number?
- Andrew Johnston's National Provider Identifier (NPI) is 1710931019, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Andrew Johnston's specialty?
- Andrew Johnston is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Andrew Johnston located?
- Andrew Johnston's practice location on file with NPPES is 275 Crossroads Blvd, Carmel, CA 93923-8684.
- What is Andrew Johnston's phone number?
- The practice phone number listed in the NPPES registry for Andrew Johnston is (831) 718-9701.
- Does Andrew Johnston accept Medicare?
- Andrew Johnston is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Andrew Johnston's NPI active?
- Yes — Andrew Johnston's NPI (1710931019) is active in the NPPES registry as of the last update on 2020-10-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.