Dr. Mary Grehian Yoo, MD
- Medicare patients, 2024
- 11
- Part D claims, 2024
- 4,122
- Hospital affiliations
- 1
- Medical group
- 1
- Insurance carriers
- 2
- Practice address
- 9455 Clairemont Mesa Blvd, San Diego, CA 92123
- Practice phone
- Call (619) 528-5000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Kaiser Permanente San Diego Medical Center
San Diego, California
Find Dr. Yoo'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. Mary Grehian Yoo is an internist in San Diego, California
Dr. Yoo practices at Kaiser Permanente San Diego Medical Center in San Diego, California.
Dr. Yoo's NPI, 1609935212, was assigned on December 8, 2006. Dr. Yoo graduated from Feinberg School of Medicine in 2002. Dr. Yoo holds California license A84430.
- NPI
- 1609935212NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5597799064
- NPI enumeration date
- December 8, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (619) 528-5000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 50
- Medical school graduation
- 2002
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Mary Grehian Yoo practices at Kaiser Permanente San Diego Medical Center in San Diego, California
Dr. Yoo's primary practice is Kaiser Permanente San Diego Medical Center, at 9455 Clairemont Mesa Blvd, San Diego, CA 92123 in San Diego County. The practice phone is (619) 528-5000.
- Kaiser Permanente San Diego Medical Center9455 Clairemont Mesa Blvd, San Diego, CA 92123 · San Diego CountyPhone(619) 528-5000
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Mary Grehian Yoo is affiliated with 2 sites of care and 1 medical group
Dr. Yoo's primary practice is Kaiser Permanente San Diego Medical Center in San Diego, California. Dr. Yoo is also affiliated with Kaiser Permanente Zion Medical Center. The medical group on file is Southern California Permanente Medical Group.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Mary Grehian Yoo's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Yoo practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Kaiser Permanente San Diego Medical Center | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Mary Grehian Yoo is one of 16,751 internists in California
Internal medicine is Dr. Yoo's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Yoo is board certified in internal medicine by the American Board of Internal Medicine. Dr. Yoo is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Clinical focus
Dmand AI lists arthritis, insomnia, lower back pain and yeast infection among the conditions Dr. Yoo treats.
Internists near Dr. Yoo
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. Mary Grehian Yoo treated 11 Medicare patients in 2024, average age 71
CMS counts 11 Medicare patients who saw Dr. Yoo in 2024. The largest group is 75 to 84, with 0 patients. Their average risk score is 1.94, 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. Yoo's median patient age at 55, with 66% women.
Dr. Yoo's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Yoo's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 55
Patient panel by sex, all payers
- Women66%
- Men33%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Mary Grehian Yoo wrote 4,122 Medicare Part D claims in 2024
In 2024, Dr. Yoo wrote 4,122 Medicare Part D claims for 555 patients. 90% of them were for generic drugs. CMS names the drug for 3,511 of them, across 77 drugs with 11 or more claims each, at $169,170 in total drug cost. In 2023, CMS named 3,119 claims across 66 drugs.
Dr. Yoo's Part D claims by kind of drug, 2024
- Generic3,715 claims90%
- Brand-name354 claims9%
- Other53 claims1%
Dr. Yoo'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. Yoo's Part D claims, 2024
- Opioids5%197 of 4,122 claims
- Antibiotics2%72 of 4,122 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: 3,1192024: 3,51113%
Drugs named by CMS: 77 in 2024, 66 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. Mary Grehian Yoo takes part in Medicare
Dr. Yoo 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)
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Dr. Mary Grehian Yoo has 2 awards and honors on record
Dmand AI lists 2 awards for Dr. Yoo, most recently NCQA DRP in 2014.
Awards and honors for Dr. Yoo
- 2014
- NCQA DRP
- 2011
- CMS Stage 1 2012
Source: Dmand AI Professional Profile Data
Dr. Mary Grehian Yoo graduated from Feinberg School of Medicine
Dr. Yoo graduated from Feinberg School of Medicine in 2002.
- Medical school
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. Mary Grehian Yoo accepts plans from 2 insurance carriers
Dr. Yoo is in network with 2 carriers, including Kaiser Permanente and CMS Medicare. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
- Kaiser Permanente
- CMS Medicare
Plan types Dr. Yoo accepts, by number of carriers
- EPO1
- HMO1
- Medicare1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. Mary Grehian Yoo'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation DataDmand AI Org Hierarchy Data |
| 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) |
| 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. Mary Grehian Yoo
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. Mary Grehian Yoo's NPI number?
Dr. Mary Grehian Yoo's NPI number is 1609935212. It was assigned on December 8, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Mary Grehian Yoo?
Dr. Mary Grehian Yoo is an internist in San Diego, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Mary Grehian Yoo practice?
Dr. Yoo practices at 9455 Clairemont Mesa Blvd, San Diego, CA 92123. Dr. Yoo's primary practice is Kaiser Permanente San Diego Medical Center in San Diego, California.
What is Dr. Mary Grehian Yoo's office phone number?
The practice phone on file for Dr. Yoo is (619) 528-5000.
What is Dr. Mary Grehian Yoo's medical license number?
Dr. Yoo holds California license A84430.
Which hospitals is Dr. Mary Grehian Yoo affiliated with?
Dr. Yoo is affiliated with Kaiser Permanente Zion Medical Center.
What medical group is Dr. Mary Grehian Yoo part of?
Dr. Yoo is linked to Southern California Permanente Medical Group.
Does Dr. Mary Grehian Yoo accept Medicare?
Yes. CMS lists Dr. Yoo as accepting Medicare assignment.
How many Medicare patients does Dr. Mary Grehian Yoo see?
CMS counts 11 Medicare patients who saw Dr. Yoo in 2024, with an average age of 71.
Is Dr. Mary Grehian Yoo board certified?
Yes. Dr. Yoo is board certified in internal medicine by the American Board of Internal Medicine.
Show 4 more questionsShow fewer questions
Where did Dr. Mary Grehian Yoo go to medical school?
Dr. Yoo graduated from Feinberg School of Medicine in 2002.
What drugs does Dr. Mary Grehian Yoo prescribe most?
In 2024 Medicare Part D data, Dr. Yoo's most prescribed drugs by claims were Atorvastatin Calcium, Lisinopril and Rosuvastatin Calcium.
How long has Dr. Mary Grehian Yoo been practicing?
Dr. Yoo graduated from medical school in 2002, 24 years ago.
What insurance does Dr. Mary Grehian Yoo accept?
Dr. Yoo is in network with 2 carriers, including Kaiser Permanente and CMS Medicare. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
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