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Dr. Aya Eguchi, MD
NPI1578732541PAC ID6103098371
- Medicare services, 2019
- 30
- Part D claims, 2024
- 17
- Publications
- 3
- Hospital affiliations
- 1
- Industry payments
- $4,081
- Practice address
- 400 North Pepper Avenue, Colton, CA 92324
- Practice phone
- Call (909) 580-1000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Eguchi'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. Aya Eguchi is an internist in Colton, California
Dr. Eguchi practices at Arrowhead Regional Medical Center in Colton, California, part of San Bernardino County.
Dr. Eguchi's NPI, 1578732541, was assigned on February 25, 2008. Dr. Eguchi graduated from Loma Linda University School Of Medicine in 2007. Dr. Eguchi holds California license A106789.
NPI and contact details
- NPI
- 1578732541NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6103098371
- NPI enumeration date
- February 25, 2008
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (909) 580-1000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 45
- Medical school graduation
- 2007
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Aya Eguchi practices at Arrowhead Regional Medical Center in Colton, California
Dr. Eguchi's primary practice is Arrowhead Regional Medical Center, at 400 North Pepper Avenue, Colton, CA 92324 in San Bernardino County. The practice phone is (909) 580-1000.
- Arrowhead Regional Medical Center400 North Pepper Avenue, Colton, CA 92324 · San Bernardino CountyPhone(909) 580-1000
Source: Dmand AI Affiliation Data
Dr. Aya Eguchi is affiliated with 1 site of care and 1 medical group
Dr. Eguchi's primary practice is Arrowhead Regional Medical Center in Colton, California, part of San Bernardino County. The medical group on file is Coalinga State Hospital.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Aya Eguchi's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Eguchi practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Arrowhead Regional Medical Center | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Aya Eguchi is one of 16,751 internists in California
Internal medicine is Dr. Eguchi's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Eguchi is board certified in internal medicine by the American Board of Internal Medicine. Dr. Eguchi is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Internists near Dr. Eguchi
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
16,751internists in California43internists in Colton32internists at Arrowhead Regional Medical Center
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Aya Eguchi billed Medicare for 30 services in 2019
CMS data shows 30 Medicare services from Dr. Eguchi across 1 procedure code in 2019. Medicare paid $747 for them. Every service was in a facility, such as a hospital, rather than an office.
Medicare services, 201930
Paid by Medicare$747
Procedure codes1
Dr. Eguchi's Medicare services by type, 2018 to 2019
- 2018
- 2019
- Office and hospital visits
- 2018: 162019: 3088%
Dr. Eguchi compared with the California median for internists, 2019
- Dr. Eguchi
- California median
- Medicare services
- 30vs 36192% below
- Part D claims
- 41vs 42190% below
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Eguchi's most billed Medicare procedure codes, 2019
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. Eguchi?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Eguchi and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Aya Eguchi's patients have a median age of 69
Across all payers, Dmand AI patient panel data puts Dr. Eguchi's median patient age at 69, with 8% women.
Dr. Eguchi'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
- Women8%
- Men92%
Source: Dmand AI Patient Panel Data
Dr. Aya Eguchi wrote 17 Medicare Part D claims in 2024
In 2024, Dr. Eguchi wrote 17 Medicare Part D claims. 82% of them were for generic drugs. They cover 1 drug, with $102 in total drug cost.
Part D claims, 202417
Drugs named by CMS1
Total drug cost$102
Dr. Eguchi's Part D claims by kind of drug, 2024
- Generic14 claims82%
- Brand-name and other3 claims18%
Dr. Eguchi's most prescribed drugs by claims, 2016
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
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. Aya Eguchi takes part in Medicare
Dr. Eguchi accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
For MedTech and pharma teams
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Dr. Aya Eguchi has 3 publications on record
Dmand AI links 3 papers to Dr. Eguchi, published from 2009 to 2015. Dr. Eguchi's most frequent co-author is Ariel E. Feldstein, MD.
Papers3
Years published2009 to 2015
Dr. Eguchi's papers by year, 2009 to 2015
Dr. Eguchi's most frequent co-authors
Recent publications by Dr. Eguchi
Nephrol Dial Transplant
CholesterolCyclosporineDrug Therapy, Combination
See who Dr. Eguchi researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Eguchi works with, so you can find a warm path to the right internists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Aya Eguchi received $4,081 in industry payments from 2016 to 2025
CMS Open Payments shows 9 general payments to Dr. Eguchi from 5 drug and device companies from 2016 to 2025. Speaker and faculty fees make up the largest share, 91% of the total. Allergan Inc. paid the most, $3,739.
General payments to Dr. Eguchi by program year, 2016 to 2025
General payments to Dr. Eguchi by kind, 2016 to 2025
$4.1Kin total
- Speaker and faculty fees$3,71491%
- Food and beverage$3679%
Companies that paid Dr. Eguchi the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Aya Eguchi has 1 award and honors on record
Dmand AI lists 1 award for Dr. Eguchi, most recently CMS Stage 1 EHR in 2013.
Awards and honors for Dr. Eguchi
- 2013
- CMS Stage 1 EHR
Source: Dmand AI Professional Profile Data
Dr. Aya Eguchi graduated from Loma Linda University School Of Medicine
Dr. Eguchi graduated from Loma Linda University School Of Medicine in 2007. Dr. Eguchi is a member of ACP.
- Medical school
- Board certified in internal medicine
- Board certified in obesity medicine
Source: Dmand AI Professional Profile Data
Dr. Aya Eguchi accepts plans from 3 insurance carriers
Dr. Eguchi is in network with 3 carriers, including Blue Cross Blue Shield of Massachusetts, HCSC and CMS Medicare. Medicare plans come from the most carriers, 3. Check the plan with the practice before a visit.
- Blue Cross Blue Shield of Massachusetts
- HCSC
- CMS Medicare
Plan types Dr. Eguchi accepts, by number of carriers
- Medicare3
- PPO2
Source: Dmand AI Insurance Network Data
Sources for Dr. Aya Eguchi'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 Data |
| 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) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| 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. Aya Eguchi
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. Aya Eguchi's NPI number?
Dr. Aya Eguchi's NPI number is 1578732541. It was assigned on February 25, 2008, and it is active in the NPI Registry.
What kind of doctor is Dr. Aya Eguchi?
Dr. Aya Eguchi is an internist in Colton, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Aya Eguchi practice?
Dr. Eguchi practices at 400 North Pepper Avenue, Colton, CA 92324. Dr. Eguchi's primary practice is Arrowhead Regional Medical Center in Colton, California, part of San Bernardino County.
What is Dr. Aya Eguchi's office phone number?
The practice phone on file for Dr. Eguchi is (909) 580-1000.
What is Dr. Aya Eguchi's medical license number?
Dr. Eguchi holds California license A106789.
Which hospitals is Dr. Aya Eguchi affiliated with?
Dr. Eguchi practices at Arrowhead Regional Medical Center in Colton, California.
What medical group is Dr. Aya Eguchi part of?
Dr. Eguchi is linked to Coalinga State Hospital.
Does Dr. Aya Eguchi accept Medicare?
Yes. CMS data shows Dr. Eguchi billed Medicare for 30 services in 2019, and Dr. Eguchi accepts Medicare assignment.
Is Dr. Aya Eguchi board certified?
Yes. Dr. Eguchi is board certified in internal medicine by the American Board of Internal Medicine.
What services does Dr. Aya Eguchi bill to Medicare?
In 2019, Dr. Eguchi's most billed Medicare services were hospital inpatient care (99231).
Show 7 more questionsShow fewer questions
Where did Dr. Aya Eguchi go to medical school?
Dr. Eguchi graduated from Loma Linda University School Of Medicine in 2007.
What drugs does Dr. Aya Eguchi prescribe most?
In 2016 Medicare Part D data, Dr. Eguchi's most prescribed drugs by claims were Warfarin Sodium.
Has Dr. Aya Eguchi received payments from drug or device companies?
CMS Open Payments shows $4,081 in general payments to Dr. Eguchi from 5 companies from 2016 to 2025. The largest total came from Allergan Inc.
How long has Dr. Aya Eguchi been practicing?
Dr. Eguchi graduated from medical school in 2007, 19 years ago.
Does Dr. Aya Eguchi do research?
Dmand AI links 3 publications to Dr. Eguchi, published from 2009 to 2015.
Who does Dr. Aya Eguchi publish with?
Dr. Eguchi's most frequent co-authors are Ariel E. Feldstein, MD (1 shared paper).
What insurance does Dr. Aya Eguchi accept?
Dr. Eguchi is in network with 3 carriers, including Blue Cross Blue Shield of Massachusetts, HCSC and CMS Medicare. Medicare plans come from the most carriers, 3. Check the plan with the practice before a visit.
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