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DR. DIEGO RAFAEL FERNANDEZ M.D.
NPI 1871957712
Internal Medicine in Oakland, CA

Active since April 06, 2016PECOS EnrolledAccepts Medicare Assignment
350 HAWTHORNE AVE STE 2308, OAKLAND, CA 94609(510) 869-6883(510) 869-6888 Get Directions Write a Review

NPPES record last updated: April 15, 2022. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: Apr 15, 2022, Dec 20, 2021, May 29, 2019 (3 updates tracked since 2019).

About Dr. Diego Rafael Fernandez M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. DIEGO RAFAEL FERNANDEZ M.D. (NPI 1871957712) is an individual internal medicine provider in Oakland, California, licensed in California (A172321) and active in the NPI registry since April 2016. He is enrolled in Medicare PECOS and is a graduate of Other (2016).

NPPES Registry Identity

NPI1871957712
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. DIEGO RAFAEL FERNANDEZCredential: M.D.
Location Address350 HAWTHORNE AVE STE 2308Oakland, CA 94609-3108
Mailing Address325 Distel CirLos Altos, CA 94022-1408 · (510) 869-6883 · Fax (510) 569-6888
Phone(510) 869-6883
Fax(510) 869-6888
Sole ProprietorNo
Medical School CMSOtherGraduated 2016
Enumeration DateApril 6, 2016
Last NPPES UpdateApril 15, 20223 updates tracked since enumeration
NPPES CertifiedApril 15, 2022
✔ NPI 1871957712 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
Licenses✔ Licensed in CA · A172321✔ Licensed in AL · MD.36555
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
350 HAWTHORNE AVE STE 2308, Oakland, CA 94609
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Other Identifiers 1

OtherA172321CA · State Medical License

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Diego Rafael Fernandez M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID8123315561
PECOS Enrollment IDI20210915003346
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims 6

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232
Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.
285 services159 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233
Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.
207 services121 patients
Hospital discharge day management, more than 30 minutes 99239
Hospital discharge day management over 30 minutes involves a detailed process to ensure a smooth transition from hospital to home. It includes final examinations, discussion of your hospital stay, post-discharge instructions, and coordinating follow-up care.
131 services130 patients
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223
Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.
46 services46 patients
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222
Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.
21 services21 patients
Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes 99231
Follow-up hospital inpatient care is a daily service where a healthcare professional checks on your health progress during your hospital stay. Each session typically lasts 15 minutes, involving updates on your condition and adjustments to your treatment plan, if necessary.
14 services11 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94609 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$153.83 typical visit price
range $69.00 – $202.35
Typical copayment $38.45 (range $17.25 – $50.58)
Most-billed visit code 99204
Established Patient
$119.48 typical visit price
range $23.44 – $166.46
Typical copayment $29.87 (range $5.86 – $41.61)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

ARYA MANSOURI M.D.
Internal Medicine
350 HAWTHORNE AVE STE 2308
OAKLAND, CA 94609
Alameda County (510) 869-6883

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Diego Fernandez's NPI number?

The NPI number for Diego Fernandez is 1871957712. It was assigned to this individual provider in the NPPES registry on April 6, 2016.

Where is Diego Fernandez located?

Diego Fernandez practices at 350 Hawthorne Ave Ste 2308, Oakland, CA 94609. The listed phone number is (510) 869-6883.

What is Diego Fernandez's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Diego Fernandez enrolled in Medicare?

Yes. Diego Fernandez is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

When was this NPI record last updated?

The NPPES record for Diego Fernandez was last updated on April 15, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.