Doctor profile · Federal record
Dr. William Johnston, M.D.
Emergency Medicine Physician (CMS: Emergency Medicine) · Palo Alto, CA
- NPI 1417366584
- Accepts Medicare
- MIPS 86.3 / 100 · 2023
- 13 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
Operates at 4 locations .
- Primary practice
-
3801 Miranda Ave
Palo Alto, CA 943041207
(650) 493-5000 - Additional location
-
1200 El Camino Real
South San Francisco, CA 940803208
(650) 742-2000 - Additional location
-
222 W 39Th Ave
San Mateo, CA 944034364
(650) 573-2222 - Additional location
-
30 Prospect Ave
Hackensack, NJ 076011914
(551) 996-2000 - Mailing address
-
2015 Ray Dr
Burlingame, CA 940104655
Show 1 more location
Credentials & registration
- NPI registered
- August 2014 — 12 yrs on file
- Profile last updated
- August 12, 2021
- Year of graduation
- 2013 — 13 yrs since
- Specialty taxonomy
- 207P00000X — NUCC code
- State license (1)
- California #A138944
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1417366584. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
28
Distinct HCPCS
2
Medicare allowed
$4,404
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99284 |
Emergency department visit with moderate level of medical decision making | 15 | 15 | $130 | |
99285 |
Emergency department visit with high level of medical decision making | 13 | 13 | $189 |
In context: peer comparison
Among 7 peers in Palo Alto Emergency Medicine Physician, average services per provider: 34. This provider delivers 0.8× the peer median.Frequently asked questions
What is Dr. William Johnston's medical specialty?
Dr. William Johnston practices Emergency Medicine Physician in Palo Alto, CA.
Where does Dr. William Johnston practice?
Dr. William Johnston practices at 3801 Miranda Ave, Palo Alto, CA 943041207. Office phone: 6504935000.
What is Dr. William Johnston's NPI?
Dr. William Johnston's National Provider Identifier (NPI) is 1417366584, issued by NPPES.
Does Dr. William Johnston accept Medicare assignment?
Yes. Dr. William Johnston accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. William Johnston commonly perform?
Top Medicare-reported procedures in 2023: Emergency department visit with moderate level of medical decision making (HCPCS 99284); Emergency department visit with high level of medical decision making (HCPCS 99285). Source: CMS Medicare Physician & Other Practitioners file.