Dr. Diego Rafael Fernandez, MD
- Medicare services, 2024
- 704
- Medicare patients, 2024
- 308
- Part D claims, 2024
- 252
- Hospital affiliations
- 2
- Industry payments
- $896
- Practice address
- 350 Hawthorne Avenue, Oakland, CA 94609
- Practice phone
- Call (510) 655-4000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Fernandez's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Diego Rafael Fernandez is an internist in Oakland, California
Dr. Fernandez practices at Alta Bates Summit Medical Center in Oakland, California, part of Sutter Health.
Dr. Fernandez's NPI, 1871957712, was assigned on April 6, 2016. Dr. Fernandez holds California license A172321.
- NPI
- 1871957712NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8123315561
- NPI enumeration date
- April 6, 2016
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (510) 655-4000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 36
- Medical school graduation
- 2016
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Diego Rafael Fernandez practices at Alta Bates Summit Medical Center in Oakland, California
Dr. Fernandez's primary practice is Alta Bates Summit Medical Center, at 350 Hawthorne Avenue, Oakland, CA 94609 in Alameda County. The practice phone is (510) 655-4000.
- Alta Bates Summit Medical Center350 Hawthorne Avenue, Oakland, CA 94609 · Alameda CountyPhone(510) 655-4000
Source: Dmand AI Affiliation Data
Dr. Diego Rafael Fernandez is affiliated with 2 sites of care and 2 medical groups
Dr. Fernandez's primary practice is Alta Bates Summit Medical Center in Oakland, California, part of Sutter Health. Dr. Fernandez is also affiliated with Alta Bates Summit Medical Center | Alta Bates Campus. The medical group on file is The Permanente Medical Group, Inc. Dmand AI also links Dr. Fernandez to 1 more medical group, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Diego Rafael Fernandez's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Fernandez practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Alta Bates Summit Medical Center | Available with a free account |
| +1 more site and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Sutter Health and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Diego Rafael Fernandez is one of 16,751 internists in California
Internal medicine is Dr. Fernandez's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dmand AI has Dr. Fernandez's licenses on file in 2 states: California and Alabama.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
- Alabama license
Internists near Dr. Fernandez
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Diego Rafael Fernandez billed Medicare for 704 services in 2024
CMS data shows 704 Medicare services from Dr. Fernandez across 6 procedure codes in 2024, for 308 Medicare patients. Medicare paid $63,618 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Fernandez's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 6542024: 7048%
Dr. Fernandez compared with the California median for internists, 2024
- Dr. Fernandez
- California median
- Medicare services
- 704vs 36195% above
- Medicare patients
- 308vs 1512.0 times
- Part D claims
- 45vs 42189% below
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Fernandez's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Fernandez?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Fernandez and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Diego Rafael Fernandez treated 308 Medicare patients in 2024, average age 76
CMS counts 308 Medicare patients who saw Dr. Fernandez in 2024. The largest group is 75 to 84, with 99 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 59% are also on Medicaid. Their average risk score is 2.69, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Fernandez's median patient age at 69, with 44% women.
Dr. Fernandez's Medicare patients by age, 2024
Dr. Fernandez's Medicare patients by sex, 2024
- Women15751%
- Men15149%
Chronic conditions among Dr. Fernandez's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Chronic kidney disease54%
- Diabetes48%
- Heart failure48%
- Ischemic heart disease47%
- Arthritis45%
- Mood disorders45%
Share of Medicare patients with each condition. A patient can have several.
Dr. Fernandez's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 69
Patient panel by sex, all payers
- Women44%
- Men48%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Diego Rafael Fernandez wrote 252 Medicare Part D claims in 2024
In 2024, Dr. Fernandez wrote 252 Medicare Part D claims for 110 patients. 86% of them were for generic drugs. CMS names the drug for 45 of them, across 3 drugs with 11 or more claims each, at $214 in total drug cost. In 2023, CMS named 53 claims across 4 drugs.
Dr. Fernandez's Part D claims by kind of drug, 2024
- Generic217 claims86%
- Brand-name35 claims14%
Dr. Fernandez's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Fernandez's Part D claims, 2024
- Opioids4%11 of 252 claims
- Antibiotics19%49 of 252 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 532024: 4515%
Drugs named by CMS: 3 in 2024, 4 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Diego Rafael Fernandez takes part in Medicare
Dr. Fernandez accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Pacemaker insertion or repair: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. Diego Rafael Fernandez received $896 in industry payments from 2019 to 2021
CMS Open Payments shows 42 general payments to Dr. Fernandez from 10 drug and device companies from 2019 to 2021. Food and beverage make up the largest share, 100% of the total. Janssen Pharmaceuticals, Inc paid the most, $340.
General payments to Dr. Fernandez by program year, 2019 to 2021
Companies that paid Dr. Fernandez the most, 2019 to 2021
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Diego Rafael Fernandez's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Diego Rafael Fernandez
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Diego Rafael Fernandez's NPI number?
Dr. Diego Rafael Fernandez's NPI number is 1871957712. It was assigned on April 6, 2016, and it is active in the NPI Registry.
What kind of doctor is Dr. Diego Rafael Fernandez?
Dr. Diego Rafael Fernandez is an internist in Oakland, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Diego Rafael Fernandez practice?
Dr. Fernandez practices at 350 Hawthorne Avenue, Oakland, CA 94609. Dr. Fernandez's primary practice is Alta Bates Summit Medical Center in Oakland, California, part of Sutter Health. Dmand AI also links Dr. Fernandez to 1 medical group.
What is Dr. Diego Rafael Fernandez's office phone number?
The practice phone on file for Dr. Fernandez is (510) 655-4000.
What is Dr. Diego Rafael Fernandez's medical license number?
Dr. Fernandez holds California license A172321, one of the licenses on file in 2 states.
Which states has Dr. Diego Rafael Fernandez been licensed in?
Dmand AI has state licenses on file for Dr. Fernandez in California and Alabama.
Which hospitals is Dr. Diego Rafael Fernandez affiliated with?
Dr. Fernandez practices at Alta Bates Summit Medical Center in Oakland, California. Dr. Fernandez is also affiliated with Alta Bates Summit Medical Center | Alta Bates Campus.
What medical group is Dr. Diego Rafael Fernandez part of?
Dr. Fernandez is linked to The Permanente Medical Group, Inc. Dmand AI links Dr. Fernandez to 1 more medical group.
Does Dr. Diego Rafael Fernandez accept Medicare?
Yes. CMS data shows Dr. Fernandez billed Medicare for 704 services in 2024, and Dr. Fernandez accepts Medicare assignment.
How many Medicare patients does Dr. Diego Rafael Fernandez see?
CMS counts 308 Medicare patients who saw Dr. Fernandez in 2024, with an average age of 76.
Show 4 more questionsShow fewer questions
What services does Dr. Diego Rafael Fernandez bill to Medicare?
In 2024, Dr. Fernandez's most billed Medicare services were hospital inpatient care (99232), hospital inpatient care (99233) and hospital inpatient care (99239).
What drugs does Dr. Diego Rafael Fernandez prescribe most?
In 2024 Medicare Part D data, Dr. Fernandez's most prescribed drugs by claims were Atorvastatin Calcium, Furosemide and Prednisone.
Has Dr. Diego Rafael Fernandez received payments from drug or device companies?
CMS Open Payments shows $896 in general payments to Dr. Fernandez from 10 companies from 2019 to 2021. The largest total came from Janssen Pharmaceuticals, Inc.
How long has Dr. Diego Rafael Fernandez been practicing?
Dr. Fernandez graduated from medical school in 2016, 10 years ago.
Selling to internal medicine practices?
See internists in California by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card