Doctor profile · Federal record
Dr. Fred Vonstieff, M.D.
Addiction Medicine (Family Medicine) Physician (CMS: Addiction Medicine) · Concord, CA
- NPI 1790849685
- Accepts Medicare
- 50 yrs in practice
- Male
- Solo practice
- No sanctions
Practice & contact
- Primary practice
-
2481 Pacheco St
Concord, CA 945202019
(925) 680-8933
fax (925) 680-7635
Credentials & registration
- NPI registered
- December 2006 — 20 yrs on file
- Profile last updated
- July 30, 2014
- Year of graduation
- 1976 — 50 yrs since
- Specialty taxonomy
- 207QA0401X — NUCC code
- State license (1)
- California #G34928
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1790849685. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
565
Distinct HCPCS
4
Medicare allowed
$66,901
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 301 | 63 | $88 | |
99223 |
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 95 | 67 | $193 | |
99239 |
Hospital discharge day management, more than 30 minutes | 94 | 66 | $129 | |
99233 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 75 | 30 | $132 |
In context: peer comparison
Among 1 peers in this city , average services per provider: 141. This provider delivers 4.0× the peer median.Open Payments
Industry payments received
All-time total
$27
Transactions
1
Manufacturers
1
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| ITI, Inc. (d/b/a Intra-Cellular Therapies, Inc.) | 1 | $27.24 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
703
Patients
456
Total drug cost
$45,046
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Gabapentin | Generic | 88 | 73 | $3,721 |
| Trazodone Hcl | Generic | 84 | 52 | $1,632 |
| Naltrexone Hcl | Generic | 76 | 49 | $7,661 |
| Hydroxyzine Pamoate | Generic | 57 | 46 | $1,122 |
| Famotidine | Generic | 55 | 50 | $352 |
| Levothyroxine Sodium | Generic | 39 | 21 | $734 |
| Quetiapine Fumarate | Generic | 39 | 24 | $1,863 |
| Atorvastatin Calcium | Generic | 38 | 18 | $667 |
| Aripiprazole | Generic | 36 | 17 | $4,361 |
| Escitalopram Oxalate | Generic | 35 | 25 | $708 |
Frequently asked questions
What is Dr. Fred Vonstieff's medical specialty?
Dr. Fred Vonstieff practices Addiction Medicine (Family Medicine) Physician in Concord, CA.
Where does Dr. Fred Vonstieff practice?
Dr. Fred Vonstieff practices at 2481 Pacheco St, Concord, CA 945202019. Office phone: 9256808933.
What is Dr. Fred Vonstieff's NPI?
Dr. Fred Vonstieff's National Provider Identifier (NPI) is 1790849685, issued by NPPES.
Does Dr. Fred Vonstieff accept Medicare assignment?
Yes. Dr. Fred Vonstieff accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Fred Vonstieff commonly perform?
Top Medicare-reported procedures in 2023: Subsequent hospital care with moderate levelof medical decision making (HCPCS 99232); Initial hospital care with moderate level of medical decision making (HCPCS 99223); Hospital discharge day management (HCPCS 99239). Source: CMS Medicare Physician & Other Practitioners file.