Doctor profile · Federal record
Dr. Spencer Chang, MD
Internal Medicine Physician (CMS: Internal Medicine) · Stanford, CA
- NPI 1275160368
- Accepts Medicare
- 6 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
300 Pasteur Dr
Stanford, CA 943052200
(650) 723-4000
Credentials & registration
- NPI registered
- March 2020 — 6 yrs on file
- Profile last updated
- April 18, 2024
- Year of graduation
- 2020 — 6 yrs since
- Specialty taxonomy
- 207R00000X — NUCC code
- State license (1)
- California #A185888
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1275160368. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
74
Distinct HCPCS
3
Medicare allowed
$7,475
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 31 | 29 | $104 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 29 | 28 | $73 | |
99204 |
New patient office or other outpatient visit, 45-59 minutes | 14 | 14 | $151 |
In context: peer comparison
Among 95 peers in Stanford Internal Medicine Physician, average services per provider: 85. This provider delivers 0.9× the peer median.Open Payments
Industry payments received
All-time total
$1,591
Transactions
3
Manufacturers
2
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Regeneron Healthcare Solutions, INC. | 2 | $1,456.00 | |
| Phathom Pharmaceuticals, INC. | 1 | $135.00 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
119
Patients
20
Total drug cost
$9,755
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Atorvastatin Calcium | Generic | 54 | 20 | $919 |
| Metformin Hcl | Generic | 16 | 0 | $211 |
| Tamsulosin Hcl | Generic | 14 | 0 | $475 |
| Lisinopril | Generic | 13 | 0 | $220 |
| Basaglar Kwikpen U-100 (Insulin Glargine,Hum.Rec.Anlog) | Brand | 11 | 0 | $7,774 |
| Diclofenac Sodium | Generic | 11 | 0 | $156 |
Hospital affiliations
Frequently asked questions
What is Dr. Spencer Chang's medical specialty?
Dr. Spencer Chang practices Internal Medicine Physician in Stanford, CA.
Where does Dr. Spencer Chang practice?
Dr. Spencer Chang practices at 300 Pasteur Dr, Stanford, CA 943052200. Office phone: 6507234000.
What is Dr. Spencer Chang's NPI?
Dr. Spencer Chang's National Provider Identifier (NPI) is 1275160368, issued by NPPES.
Does Dr. Spencer Chang accept Medicare assignment?
Yes. Dr. Spencer Chang accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Spencer Chang commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99214); Established patient office or other outpatient visit (HCPCS 99213); New patient office or other outpatient visit (HCPCS 99204). Source: CMS Medicare Physician & Other Practitioners file.