Doctor profile · Federal record
Dr. Stephen Walston, MD
Internal Medicine Physician (CMS: Internal Medicine) · Mercer Island, WA
- NPI 1578887519
- Accepts Medicare
- 16 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
3236 78Th Ave Se Ste 200
Mercer Island, WA 980403500
(206) 386-9500
fax (206) 386-9605 - Mailing address
-
Po Box 25608
Salt Lake City, UT 841250608
Credentials & registration
- NPI registered
- March 2010 — 16 yrs on file
- Profile last updated
- November 11, 2021
- Year of graduation
- 2010 — 16 yrs since
- Specialty taxonomy
- 207R00000X — NUCC code
- State license (1)
- Washington #MD60423761
- Medicaid (2)
- WA #1578887519 · WA #2022131
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1578887519. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
481
Distinct HCPCS
9
Medicare allowed
$64,682
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 240 | 137 | $138 | |
G0439 |
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit | 63 | 63 | $142 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 59 | 51 | $97 | |
99204 |
New patient office or other outpatient visit, 45-59 minutes | 43 | 43 | $182 | |
99215 |
Established patient office or other outpatient visit, 40-54 minutes | 26 | 18 | $196 | |
93005 |
Routine electrocardiogram (ecg) using at least 12 leads with tracing | 16 | 16 | $8 | |
G0009 |
Administration of pneumococcal vaccine | 12 | 12 | $34 | |
90677 |
Pneumococcal conjugate vaccine, 20 valent (pcv20), for intramuscular use | 11 | 11 | $282 | |
G0008 |
Administration of influenza virus vaccine | 11 | 11 | $34 |
In context: peer comparison
Among 4 peers in Mercer Island Internal Medicine Physician, average services per provider: 76. This provider delivers 6.3× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
979
Patients
299
Total drug cost
$110,196
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Atorvastatin Calcium | Generic | 196 | 66 | $2,703 |
| Amlodipine Besylate | Generic | 126 | 43 | $977 |
| Levothyroxine Sodium | Generic | 92 | 32 | $1,181 |
| Losartan Potassium | Generic | 89 | 28 | $1,175 |
| Rosuvastatin Calcium | Generic | 71 | 24 | $2,398 |
| Lisinopril | Generic | 60 | 21 | $611 |
| Eliquis (Apixaban) | Brand | 56 | 12 | $60,934 |
| Tamsulosin Hcl | Generic | 52 | 17 | $1,570 |
| Metoprolol Succinate | Generic | 48 | 20 | $1,104 |
| Metformin Hcl | Generic | 36 | 13 | $320 |
Hospital affiliations
Frequently asked questions
What is Dr. Stephen Walston's medical specialty?
Dr. Stephen Walston practices Internal Medicine Physician in Mercer Island, WA.
Where does Dr. Stephen Walston practice?
Dr. Stephen Walston practices at 3236 78Th Ave Se Ste 200, Mercer Island, WA 980403500. Office phone: 2063869500.
What is Dr. Stephen Walston's NPI?
Dr. Stephen Walston's National Provider Identifier (NPI) is 1578887519, issued by NPPES.
Does Dr. Stephen Walston accept Medicare assignment?
Yes. Dr. Stephen Walston accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Stephen Walston commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99214); Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (HCPCS G0439); Established patient office or other outpatient visit (HCPCS 99213). Source: CMS Medicare Physician & Other Practitioners file.