Doctor profile · Federal record
Dr. William Mills, M.D.
Emergency Medicine Physician (CMS: Emergency Medicine) · Walnut Creek, CA
- NPI 1497779300
- Accepts Medicare
- MIPS 86.3 / 100 · 2023
- 33 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
1601 Ygnacio Valley RD
Walnut Creek, CA 945983122
(925) 939-3000 - Mailing address
-
2100 Powell St, Suite 900
Emeryville, CA 946081826
Credentials & registration
- NPI registered
- July 2006 — 20 yrs on file
- Profile last updated
- October 26, 2007
- Year of graduation
- 1993 — 33 yrs since
- Specialty taxonomy
- 207P00000X — NUCC code
- State license (1)
- California #A62432
- Medicaid
- CA #00A624320
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1497779300. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
420
Distinct HCPCS
4
Medicare allowed
$67,198
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99285 |
Emergency department visit with high level of medical decision making | 231 | 227 | $188 | |
99284 |
Emergency department visit with moderate level of medical decision making | 88 | 88 | $130 | |
99291 |
Critical care, first 30-74 minutes | 51 | 49 | $234 | |
93010 |
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only | 50 | 47 | $9 |
In context: peer comparison
Among 26 peers in Walnut Creek Emergency Medicine Physician, average services per provider: 87. This provider delivers 4.8× the peer median.Open Payments
Industry payments received
All-time total
$50
Transactions
1
Manufacturers
1
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Globus Medical, INC. | 1 | $50.33 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
42
Patients
42
Total drug cost
$494
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Hydrocodone-Acetaminophen (Hydrocodone/Acetaminophen) | Brand | 17 | 17 | $85 |
| Cephalexin | Generic | 14 | 14 | $183 |
| Nitrofurantoin Mono-Macro (Nitrofurantoin Monohyd/M-Cryst) | Brand | 11 | 11 | $225 |
Hospital affiliations
Frequently asked questions
What is Dr. William Mills's medical specialty?
Dr. William Mills practices Emergency Medicine Physician in Walnut Creek, CA.
Where does Dr. William Mills practice?
Dr. William Mills practices at 1601 Ygnacio Valley RD, Walnut Creek, CA 945983122. Office phone: 9259393000.
What is Dr. William Mills's NPI?
Dr. William Mills's National Provider Identifier (NPI) is 1497779300, issued by NPPES.
Does Dr. William Mills accept Medicare assignment?
Yes. Dr. William Mills accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. William Mills commonly perform?
Top Medicare-reported procedures in 2023: Emergency department visit with high level of medical decision making (HCPCS 99285); Emergency department visit with moderate level of medical decision making (HCPCS 99284); Critical care (HCPCS 99291). Source: CMS Medicare Physician & Other Practitioners file.