Doctor profile · Federal record
Dr. Andrew Johnston, MD
Internal Medicine Physician (CMS: Internal Medicine) · Internal Medicine Physician · Carmel, CA
- NPI 1710931019
- Accepts Medicare
- 40 yrs in practice
- Licensed in 2 states
- Male
- Group practice
- No sanctions
Practice & contact
Operates at 2 locations .
- Primary practice
-
275 Crossroads Blvd, A
Carmel, CA 939238684
(831) 718-9701 - Additional location
-
3750 Rohnerville Road
Fortuna, CA 95540
(707) 725-4477
fax (707) 725-2978 - Mailing address
-
670 9Th St Ste 203
Arcata, CA 955216249
Credentials & registration
- NPI registered
- May 2006 — 20 yrs on file
- Profile last updated
- October 30, 2020
- Year of graduation
- 1986 — 40 yrs since
- Specialty taxonomy
- 207R00000X — NUCC code
- State licenses (2)
- California #G88534 · Arizona #25495
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1710931019. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
166
Distinct HCPCS
3
Medicare allowed
$1,250
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
83036 |
Hemoglobin a1c level | 94 | 75 | $10 | |
85610 |
Blood test, clotting time | 51 | 11 | $4 | |
93005 |
Routine electrocardiogram (ecg) using at least 12 leads with tracing | 21 | 20 | $7 |
In context: peer comparison
Among 5 peers in this city , average services per provider: 93. This provider delivers 1.8× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
3,815
Patients
1,039
Total drug cost
$82,285
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Atorvastatin Calcium | Generic | 655 | 191 | $12,446 |
| Amlodipine Besylate | Generic | 350 | 105 | $5,165 |
| Levothyroxine Sodium | Generic | 295 | 81 | $6,868 |
| Hydrocodone-Acetaminophen (Hydrocodone/Acetaminophen) | Brand | 285 | 51 | $8,272 |
| Losartan Potassium | Generic | 265 | 77 | $4,500 |
| Gabapentin | Generic | 241 | 52 | $6,632 |
| Metformin Hcl | Generic | 236 | 65 | $3,056 |
| Pregabalin | Generic | 221 | 41 | $7,243 |
| Omeprazole | Generic | 216 | 65 | $5,178 |
| Lisinopril | Generic | 203 | 60 | $2,992 |
Hospital affiliations
Frequently asked questions
What is Dr. Andrew Johnston's medical specialty?
Dr. Andrew Johnston practices Internal Medicine Physician in Carmel, CA.
Where does Dr. Andrew Johnston practice?
Dr. Andrew Johnston practices at 275 Crossroads Blvd, Carmel, CA 939238684. Office phone: 8317189701.
What is Dr. Andrew Johnston's NPI?
Dr. Andrew Johnston's National Provider Identifier (NPI) is 1710931019, issued by NPPES.
Does Dr. Andrew Johnston accept Medicare assignment?
Yes. Dr. Andrew Johnston accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Andrew Johnston commonly perform?
Top Medicare-reported procedures in 2023: Hemoglobin a1c level (HCPCS 83036); Blood test, clotting time (HCPCS 85610); Routine electrocardiogram (ecg) using at least 12 leads with tracing (HCPCS 93005). Source: CMS Medicare Physician & Other Practitioners file.