1. Home
  2. Directory
  3. California
  4. Castro Valley
  5. Internal Medicine
  6. NPI Profile

DR. RAHEL TEFERI RUIZ
NPI 1821089129
Internal Medicine in Castro Valley, CA

Active since November 04, 2005PECOS EnrolledAccepts Medicare Assignment
18675 BUREN PL, CASTRO VALLEY, CA 94552(510) 881-2192(510) 363-8642 Get Directions Write a Review

NPPES record last updated: December 24, 2019. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Dr. Rahel Teferi Ruiz NPPES

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

DR. RAHEL TEFERI RUIZ (NPI 1821089129) is an individual internal medicine provider in Castro Valley, California, licensed in California (A64304) and active in the NPI registry since November 2005. She is enrolled in Medicare PECOS and is a graduate of Harvard Medical School (1996).

NPPES Registry Identity

NPI1821089129
Entity TypeIndividualFemale
Primary Taxonomy207R00000X
Provider Legal NameDR. RAHEL TEFERI RUIZ
Location Address18675 BUREN PLCastro Valley, CA 94552-5281
Mailing Address3300 Webster St, Ste 1000Oakland, CA 94609-3125 · (510) 271-4400
Phone(510) 881-2192
Fax(510) 363-8642
Sole ProprietorYes
Medical School CMSHarvard Medical SchoolGraduated 1996
Enumeration DateNovember 4, 2005
Last NPPES UpdateDecember 24, 2019
✔ NPI 1821089129 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in CA · A64304
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.
18675 BUREN PL, Castro Valley, CA 94552
Open in Google Maps ↗

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Rahel Teferi Ruiz 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 ID3476571357
PECOS Enrollment IDI20051109000537
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.

Medicare Billing Reassignment

Medicare enrollment records show Rahel Ruiz reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Hill Health Inc A Medical Corporation
14 mi
General Practice
3300 WEBSTER ST
Oakland, CA 94609
  • Reassigned Medicare billing, California enrollment
  • 17 clinicians in this Medicare group
NPI 1245607456 (925) 327-6964

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 8

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.

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
356 services175 patients
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
144 services91 patients
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit G0439
An annual wellness visit is a yearly appointment with your primary care provider to create or update a personalized prevention plan. This plan helps prevent illness based on your current health and risk factors. It's a subsequent visit, meaning it follows an initial assessment.
110 services110 patients
Influenza vaccine split virus, preservative free 90662
The Influenza Vaccine Split Virus, preservative-free, is a flu shot to protect against the influenza virus. It is made from parts of inactivated flu viruses and doesn't contain preservatives, reducing potential side effects. It helps your body develop immunity to the flu.
59 services57 patients
Administration of influenza virus vaccine G0008
The administration of the influenza virus vaccine, also known as the flu shot, is a simple procedure to protect against the flu. A healthcare provider injects a small dose of the vaccine into your arm. This stimulates your immune system to produce antibodies, which will help your body fight off the flu if exposed.
59 services57 patients
Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215
This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.
45 services38 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94552 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.

Referred Medical Equipment & Supplies CMS DME claims

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Blood glucose test or reagent strips for home blood glucose monitor, per 50 strips A4253
DME-Other DME · category DE017N
7 suppliers14 claims36 services$6.03 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES

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

RAHEL TEFERI RUIZ MD, INC.
Internal Medicine
18675 BUREN PL
CASTRO VALLEY, CA 94552
Alameda County (510) 881-2192

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 Rahel Ruiz's NPI number?

The NPI number for Rahel Ruiz is 1821089129. It was assigned to this individual provider in the NPPES registry on November 4, 2005.

Where is Rahel Ruiz located?

Rahel Ruiz practices at 18675 Buren Pl, Castro Valley, CA 94552. The listed phone number is (510) 881-2192.

What is Rahel Ruiz's specialty?

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

Is Rahel Ruiz enrolled in Medicare?

Yes. Rahel Ruiz 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.

Which organization bills Medicare for Rahel Ruiz's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Rahel Ruiz reassigns Medicare benefits to Hill Health Inc A Medical Corporation (Oakland, CA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Rahel Ruiz's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Rahel Ruiz was last updated on December 24, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.