Doctor profile · Federal record
Dr. Diana Hess, MD
Internal Medicine Physician (CMS: Internal Medicine) · Castro Valley, CA
- NPI 1295296275
- Accepts Medicare
- 7 yrs in practice
- Female
- Group practice
- No sanctions
Practice & contact
Operates at 3 locations .
- Primary practice
-
20101 Lake Chabot RD Fl 3
Castro Valley, CA 945465305
(510) 886-3400 - Additional location
-
101 the City Dr S Ste 400
Orange, CA 928683201
(714) 456-5691
fax (714) 456-8874 - Additional location
-
1451 Irvine Blvd
Tustin, CA 927803804
(714) 838-8878 - Mailing address
-
Po Box 276950
Sacramento, CA 958276950
Credentials & registration
- NPI registered
- March 2019 — 7 yrs on file
- Profile last updated
- October 30, 2024
- Year of graduation
- 2019 — 7 yrs since
- Specialty taxonomy
- 207R00000X — NUCC code
- State license (1)
- California #178427
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1295296275. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
409
Distinct HCPCS
9
Medicare allowed
$44,229
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 156 | 95 | $82 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 113 | 71 | $111 | |
99204 |
New patient office or other outpatient visit, 45-59 minutes | 43 | 43 | $179 | |
G0439 |
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit | 29 | 29 | $90 | |
99205 |
New patient office or other outpatient visit, 60-74 minutes | 17 | 17 | $237 | |
99203 |
New patient office or other outpatient visit, 30-44 minutes | 15 | 15 | $121 | |
G0008 |
Administration of influenza virus vaccine | 13 | 13 | $33 | |
90662 |
Influenza vaccine split virus, preservative free | 12 | 12 | $72 | |
G0438 |
Annual wellness visit; includes a personalized prevention plan of service (pps), initial visit | 11 | 11 | $129 |
In context: peer comparison
Among 12 peers in Castro Valley Internal Medicine Physician, average services per provider: 154. This provider delivers 2.7× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
419
Patients
113
Total drug cost
$5,872
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Amlodipine Besylate | Generic | 57 | 19 | $585 |
| Atorvastatin Calcium | Generic | 53 | 26 | $880 |
| Levothyroxine Sodium | Generic | 40 | 17 | $885 |
| Alprazolam | Generic | 28 | 0 | $43 |
| Gabapentin | Generic | 27 | 0 | $147 |
| Metformin Hcl | Generic | 26 | 11 | $383 |
| Rosuvastatin Calcium | Generic | 26 | 12 | $881 |
| Losartan Potassium | Generic | 25 | 12 | $467 |
| Diclofenac Sodium | Generic | 24 | 16 | $720 |
| Furosemide | Generic | 20 | 0 | $206 |
Hospital affiliations
Frequently asked questions
What is Dr. Diana Hess's medical specialty?
Dr. Diana Hess practices Internal Medicine Physician in Castro Valley, CA.
Where does Dr. Diana Hess practice?
Dr. Diana Hess practices at 20101 Lake Chabot RD Fl 3, Castro Valley, CA 945465305. Office phone: 5108863400.
What is Dr. Diana Hess's NPI?
Dr. Diana Hess's National Provider Identifier (NPI) is 1295296275, issued by NPPES.
Does Dr. Diana Hess accept Medicare assignment?
Yes. Dr. Diana Hess accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Diana Hess 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); New patient office or other outpatient visit (HCPCS 99204). Source: CMS Medicare Physician & Other Practitioners file.