Doctor profile · Federal record
Dr. Yinchong Mak, MD
Internal Medicine Physician (CMS: Internal Medicine) · Student in an Organized Health Care Education/Training Program · Palo Alto, CA
- NPI 1982930491
- Accepts Medicare
- 17 yrs in practice
- Female
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
795 El Camino Real
Palo Alto, CA 940406203
(650) 321-4121 - Mailing address
-
325 Distel Cir
Los Altos, CA 940221408
Credentials & registration
- NPI registered
- October 2009 — 17 yrs on file
- Profile last updated
- June 4, 2020
- Year of graduation
- 2009 — 17 yrs since
- Specialty taxonomy
- 207R00000X — NUCC code
- State license (1)
- California #A114561
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1982930491. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
631
Distinct HCPCS
10
Medicare allowed
$79,212
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 182 | 144 | $110 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 171 | 111 | $154 | |
G0439 |
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit | 114 | 114 | $160 | |
G0180 |
Physician or allowed practitioner certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians and | 38 | 27 | $66 | |
99212 |
Established patient office or other outpatient visit, 10-19 minutes | 33 | 33 | $71 | |
G0008 |
Administration of influenza virus vaccine | 24 | 24 | $38 | |
90694 |
Influenza vaccine, quadrivalent inactivated, 0.5 ml dosage | 23 | 23 | $76 | |
99215 |
Established patient office or other outpatient visit, 40-54 minutes | 18 | 15 | $218 | |
69209 |
Removal of impacted ear wax by washing | 16 | 16 | $22 | |
99495 |
Transitional care management services for problem of at least moderate complexity | 12 | 12 | $255 |
In context: peer comparison
Among 30 peers in Palo Alto Internal Medicine Physician, average services per provider: 82. This provider delivers 7.7× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
1,293
Patients
350
Total drug cost
$21,152
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Atorvastatin Calcium | Generic | 272 | 78 | $3,951 |
| Amlodipine Besylate | Generic | 197 | 53 | $1,682 |
| Levothyroxine Sodium | Generic | 133 | 31 | $2,346 |
| Losartan Potassium | Generic | 102 | 29 | $1,287 |
| Gabapentin | Generic | 89 | 28 | $2,643 |
| Simvastatin | Generic | 83 | 20 | $1,130 |
| Hydrochlorothiazide | Generic | 70 | 18 | $286 |
| Trazodone Hcl | Generic | 58 | 16 | $2,332 |
| Alendronate Sodium | Generic | 53 | 15 | $573 |
| Omeprazole | Generic | 48 | 16 | $721 |
Hospital affiliations
Frequently asked questions
What is Dr. Yinchong Mak's medical specialty?
Dr. Yinchong Mak practices Internal Medicine Physician in Palo Alto, CA.
Where does Dr. Yinchong Mak practice?
Dr. Yinchong Mak practices at 795 El Camino Real, Palo Alto, CA 940406203. Office phone: 6503214121.
What is Dr. Yinchong Mak's NPI?
Dr. Yinchong Mak's National Provider Identifier (NPI) is 1982930491, issued by NPPES.
Does Dr. Yinchong Mak accept Medicare assignment?
Yes. Dr. Yinchong Mak accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Yinchong Mak commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99213); Established patient office or other outpatient visit (HCPCS 99214); Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (HCPCS G0439). Source: CMS Medicare Physician & Other Practitioners file.