Doctor profile · Federal record
Dr. Dirk Diefendorf, M.D.
Sports Medicine (Neuromusculoskeletal Medicine) Physician (CMS: Orthopedic Surgery) · San Mateo, CA
- NPI 1467559443
- Accepts Medicare
- MIPS 100.0 / 100 · 2023
- 43 yrs in practice
- Male
- Solo practice
- No sanctions
Practice & contact
- Primary practice
-
101 S Ellsworth Ave, Suite 607
San Mateo, CA 944013956
(650) 347-0157
fax (650) 347-0566
Credentials & registration
- NPI registered
- September 2006 — 20 yrs on file
- Profile last updated
- August 30, 2010
- Year of graduation
- 1983 — 43 yrs since
- Specialty taxonomy
- 204C00000X — NUCC code
- State license (1)
- California #G53558
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1467559443. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
521
Distinct HCPCS
4
Medicare allowed
$79,980
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 290 | 159 | $153 | |
99204 |
New patient office or other outpatient visit, 45-59 minutes | 110 | 110 | $198 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 97 | 71 | $109 | |
99203 |
New patient office or other outpatient visit, 30-44 minutes | 24 | 24 | $134 |
In context: peer comparison
Among 1 peers in this city , average services per provider: 130. This provider delivers 4.0× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
204
Patients
101
Total drug cost
$1,522
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Meloxicam | Generic | 125 | 52 | $452 |
| Diclofenac Sodium | Generic | 27 | 14 | $433 |
| Cephalexin | Generic | 21 | 19 | $166 |
| Hydrocodone-Acetaminophen (Hydrocodone/Acetaminophen) | Brand | 18 | 16 | $82 |
| Nabumetone | Generic | 13 | 0 | $389 |
Hospital affiliations
Frequently asked questions
What is Dr. Dirk Diefendorf's medical specialty?
Dr. Dirk Diefendorf practices Sports Medicine (Neuromusculoskeletal Medicine) Physician in San Mateo, CA.
Where does Dr. Dirk Diefendorf practice?
Dr. Dirk Diefendorf practices at 101 S Ellsworth Ave, San Mateo, CA 944013956. Office phone: 6503470157.
What is Dr. Dirk Diefendorf's NPI?
Dr. Dirk Diefendorf's National Provider Identifier (NPI) is 1467559443, issued by NPPES.
Does Dr. Dirk Diefendorf accept Medicare assignment?
Yes. Dr. Dirk Diefendorf accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Dirk Diefendorf commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99214); New patient office or other outpatient visit (HCPCS 99204); Established patient office or other outpatient visit (HCPCS 99213). Source: CMS Medicare Physician & Other Practitioners file.