Doctor profile · Federal record
Dr. Christopher di Simone, M.D.
Medical Oncology Physician (CMS: Hematology/Oncology) · Hematology & Oncology Physician · Santa Rosa, CA
- NPI 1861461147
- Accepts Medicare
- MIPS 92.5 / 100 · 2023
- 27 yrs in practice
- Licensed in 2 states
- Male
- Group practice
- No sanctions
Practice & contact
Operates at 4 locations .
- Primary practice
-
3555 Round Barn Cir
Santa Rosa, CA 954031757
(707) 528-1050 - Additional location
-
39000 Bob Hope Dr
Rancho Mirage, CA 922703221
(760) 346-7655
fax (760) 773-1667 - Additional location
-
415 S Palm Canyon Dr
Palm Springs, CA 922627303
(760) 346-7655
fax (760) 773-1668 - Additional location
-
57725 29 Palms Hwy
Yucca Valley, CA 922843044
(760) 228-9900
fax (760) 773-1668 - Mailing address
-
39000 Bob Hope Dr
Rancho Mirage, CA 922703221
Show 1 more location
Credentials & registration
- NPI registered
- March 2006 — 20 yrs on file
- Profile last updated
- December 19, 2025
- Year of graduation
- 1999 — 27 yrs since
- Specialty taxonomy
- 207RX0202X — NUCC code
- State licenses (2)
- California #A74788 · Arizona #A74788
- Medicaid
- AZ #940917
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1861461147. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
195
Distinct HCPCS
6
Medicare allowed
$26,673
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 74 | 71 | $131 | |
96375 |
Injection of additional new drug or substance into vein | 29 | 12 | $15 | |
96413 |
Administration of chemotherapy into vein, 1 hour or less | 25 | 20 | $125 | |
99215 |
Established patient office or other outpatient visit, 40-54 minutes | 24 | 22 | $191 | |
99204 |
New patient office or other outpatient visit, 45-59 minutes | 23 | 23 | $178 | |
99205 |
New patient office or other outpatient visit, 60-74 minutes | 20 | 20 | $236 |
In context: peer comparison
Among 2 peers in this city , average services per provider: 46. This provider delivers 4.2× the peer median.Open Payments
Industry payments received
All-time total
$478
Transactions
18
Manufacturers
10
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Janssen Biotech, Inc. | 4 | $88.20 | |
| Lilly USA, LLC | 3 | $81.90 | |
| Daiichi Sankyo Inc. | 3 | $77.34 | |
| SpringWorks Therapeutics, Inc. | 2 | $63.77 | |
| ARRAY BIOPHARMA INC | 1 | $35.19 | |
| PFIZER INC. | 1 | $34.31 | |
| Celgene Corporation | 1 | $29.84 | |
| AstraZeneca Pharmaceuticals LP | 1 | $26.56 | |
| GlaxoSmithKline, LLC. | 1 | $23.35 | |
| Genentech USA, Inc. | 1 | $17.10 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
315
Patients
50
Total drug cost
$977,860
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Anastrozole | Generic | 59 | 22 | $1,486 |
| Prednisone | Generic | 31 | 12 | $199 |
| Xtandi (Enzalutamide) | Brand | 28 | 0 | $415,704 |
| Eliquis (Apixaban) | Brand | 23 | 0 | $17,709 |
| Ondansetron Odt (Ondansetron) | Brand | 23 | 16 | $1,017 |
| Keytruda (Pembrolizumab) | Brand | 20 | 0 | $234,994 |
| Letrozole | Generic | 19 | 0 | $326 |
| Tamoxifen Citrate | Generic | 18 | 0 | $351 |
| Xarelto (Rivaroxaban) | Brand | 18 | 0 | $20,549 |
| Xgeva (Denosumab) | Brand | 16 | 0 | $51,312 |
Hospital affiliations
Frequently asked questions
What is Dr. Christopher di Simone's medical specialty?
Dr. Christopher di Simone practices Medical Oncology Physician in Santa Rosa, CA.
Where does Dr. Christopher di Simone practice?
Dr. Christopher di Simone practices at 3555 Round Barn Cir, Santa Rosa, CA 954031757. Office phone: 7075281050.
What is Dr. Christopher di Simone's NPI?
Dr. Christopher di Simone's National Provider Identifier (NPI) is 1861461147, issued by NPPES.
Does Dr. Christopher di Simone accept Medicare assignment?
Yes. Dr. Christopher di Simone accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Christopher di Simone commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99214); Injection of additional new drug or substance into vein (HCPCS 96375); Administration of chemotherapy into vein (HCPCS 96413). Source: CMS Medicare Physician & Other Practitioners file.