Andrew C. Johnston, MD
Internal Medicine Physician · Carmel, CA
Andrew C. Johnston, MD is an internal medicine physician with a practice address in Carmel, California, and NPI 1710931019, issued on May 20, 2006. Check the license (California G88534, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Andrew C. Johnston
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- G88534 CA
25495 AZ
Self-reported in NPPES; status is on the state search - Practice location
- 275 Crossroads Blvd, Carmel, CA 93923
- Phone
- (831) 718-9701
- Enumerated
- May 20, 2006
- Record last updated
- Oct 30, 2020 (not updated in 6 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20091026000627); accepts Medicare assignment
- Medical or professional school
- Northwestern University Feinberg Medical School, 1986
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 275 Crossroads Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Keiko Saito, M.D.Internal Medicine Physician1407080831
Verify Andrew C. Johnston in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G88534Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.4 times the Medicare Part D claims of the average internal medicine physician in 2024
10,715 Medicare Part D claims for 532 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims. 781 claims were for opioids.
Most prescribed
- Atorvastatin Calcium742 claims
- Amlodipine Besylate435 claims
- Losartan Potassium366 claims
- Hydrocodone-Acetaminophen363 claims
- Levothyroxine Sodium293 claims
- Pregabalin251 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Open Door Community Health CentersCrescent City, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Andrew C. Johnston among 17,696 internal medicine physician records in California
Andrew C. Johnston, MD is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1986 · median 2004 among the 11,065 with a school on file
- Record last updated2020 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
12 internal medicine physician records list a practice address in Carmel
They are 12 of the 245 NPPES records with a practice address in Carmel, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Carmel → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Jessitasinghna Albert Messiah Dhas, MDCarmel, CA 939231508392911
- Carl Bergstrom, MDCarmel, CA 939231407937139
- Walter Holz, MDCarmel, CA 939231255443495
- Denise Mark, M.D.Carmel, CA 939231558437004
- Matthew NeohCarmel, CA 939231215390935
- Roger Newton, M.D.Carmel, CA 939231902270374
- Gediminas Ruibys, M.D.Carmel, CA 939231932365780
- Keiko Saito, M.D.Carmel, CA 939231407080831
Common questions
What is Andrew C. Johnston, MD's NPI number?
Andrew C. Johnston, MD's National Provider Identifier (NPI) is 1710931019, issued on May 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Andrew C. Johnston, MD located?
The NPPES record lists a practice address at 275 Crossroads Blvd, Carmel, CA, 93923. Phone: (831) 718-9701. Providers update this record themselves, so call before visiting.
How can I verify Andrew C. Johnston, MD's license?
NPPES lists California license number G88534, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Andrew C. Johnston, MD prescribe under Medicare Part D?
In 2024, Andrew C. Johnston, MD had 10,715 Medicare Part D claims for 532 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.