Dr. Sabrina Grassl Diaz, MD
- Medicare services, 2024
- 1,040
- Medicare patients, 2024
- 608
- Part D claims, 2024
- 173
- MIPS score, 2024
- 97
- Hospital affiliations
- 1
- Practice address
- 2121 Santa Monica Blvd, Santa Monica, CA 90404
- Practice phone
- Call (310) 829-5511
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
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Dr. Sabrina Grassl Diaz is an emergency medicine physician in Santa Monica, California
Dr. Diaz practices at Providence Saint John's Health Center in Santa Monica, California, part of Providence Health & Services.
Dr. Diaz's NPI, 1609800622, was assigned on July 10, 2006. Dr. Diaz graduated from Saint Louis University School Of Medicine in 1998. Dr. Diaz holds California license A72139.
- NPI
- 1609800622NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5991699571
- NPI enumeration date
- July 10, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (310) 829-5511
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 54
- Medical school graduation
- 1998
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Sabrina Grassl Diaz practices at Providence Saint John's Health Center in Santa Monica, California
Dr. Diaz's primary practice is Providence Saint John's Health Center, at 2121 Santa Monica Blvd, Santa Monica, CA 90404 in Los Angeles County. The practice phone is (310) 829-5511.
- Providence Saint John's Health Center2121 Santa Monica Blvd, Santa Monica, CA 90404 · Los Angeles CountyPhone(310) 829-5511
Source: Dmand AI Affiliation Data
Dr. Sabrina Grassl Diaz is affiliated with 4 sites of care and 3 medical groups
Dr. Diaz's primary practice is Providence Saint John's Health Center in Santa Monica, California, part of Providence Health & Services. The medical group on file is Vituity. Dmand AI also links Dr. Diaz to 3 more group practices and clinics and 2 medical groups, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Sabrina Grassl Diaz's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Diaz practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Providence Saint John's Health Center | Available with a free account |
| +3 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Sabrina Grassl Diaz is one of 7,423 emergency medicine physicians in California
Emergency medicine is Dr. Diaz's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dr. Diaz is board certified in emergency medicine by the American Board of Emergency Medicine. Dr. Diaz is licensed in California.
Specialties and state licenses
- Emergency medicine, CaliforniaPrimary
Emergency medicine physicians near Dr. Diaz
Counts of emergency medicine physicians 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. Sabrina Grassl Diaz billed Medicare for 1,040 services in 2024
CMS data shows 1,040 Medicare services from Dr. Diaz across 11 procedure codes in 2024, for 608 Medicare patients. Medicare paid $72,588 for them.
Dr. Diaz's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 5532024: 48113%
- Tests and treatments
- 2023: 4692024: 4504%
- Lab and pathology
- 2023: 292024: 109276%
Where Dr. Diaz's Medicare services took place, 2024
- In an office20820%
- In a facility83280%
Dr. Diaz compared with the California median for emergency medicine physicians, 2024
- Dr. Diaz
- California median
- Medicare services
- 1,040vs 2653.9 times
- Medicare patients
- 608vs 2432.5 times
- Part D claims
- 66vs 626% above
Medians across 7,079 emergency medicine physicians in California with Dmand AI profiles that report each measure.
Dr. Diaz'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.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Sabrina Grassl Diaz treated 608 Medicare patients in 2024, average age 79
CMS counts 608 Medicare patients who saw Dr. Diaz in 2024. The largest group is 75 to 84, with 205 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 30% are also on Medicaid. Their average risk score is 2.00, 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. Diaz's median patient age at 59, with 60% women.
Dr. Diaz's Medicare patients by age, 2024
Dr. Diaz's Medicare patients by sex, 2024
- Women36660%
- Men24240%
Chronic conditions among Dr. Diaz's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis63%
- Ischemic heart disease51%
- Mood disorders41%
- Anxiety38%
- Depression38%
- Heart failure38%
Share of Medicare patients with each condition. A patient can have several.
Dr. Diaz's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 59
Patient panel by sex, all payers
- Women60%
- Men39%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Sabrina Grassl Diaz wrote 173 Medicare Part D claims in 2024
In 2024, Dr. Diaz wrote 173 Medicare Part D claims for 136 patients. 86% of them were for generic drugs. CMS names the drug for 66 of them, across 4 drugs with 11 or more claims each, at $509 in total drug cost. In 2023, CMS named 23 claims across 1 drug.
Dr. Diaz's Part D claims by kind of drug, 2024
- Generic149 claims86%
- Brand-name and other24 claims14%
Dr. Diaz'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. Diaz's Part D claims, 2024
- Antibiotics43%75 of 173 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: 232024: 66187%
Drugs named by CMS: 4 in 2024, 1 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
Dr. Sabrina Grassl Diaz scored 97 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 97 out of 100 for Dr. Diaz for performance year 2024, reported as part of a group. Dr. Diaz accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Diaz's MIPS scores, performance year 2024
- 97of 100Final score
- 90of 100Quality
- 40of 100Improvement Activities
- 78of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Sabrina Grassl Diaz received $730 in industry payments from 2016 to 2025
CMS Open Payments shows 12 general payments to Dr. Diaz from 8 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Amgen Inc. paid the most, $251.
General payments to Dr. Diaz by program year, 2016 to 2025
Companies that paid Dr. Diaz 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. Sabrina Grassl Diaz graduated from Saint Louis University School Of Medicine
Dr. Diaz graduated from Saint Louis University School Of Medicine in 1998. Dr. Diaz is a member of ACEP.
- Medical school
- Board certified in emergency medicine
Source: Dmand AI Professional Profile Data
Dr. Sabrina Grassl Diaz accepts plans from 12 insurance carriers
Dr. Diaz is in network with 12 carriers, including United Healthcare, Elevance and Aetna. PPO plans come from the most carriers, 7. Check the plan with the practice before a visit.
- United Healthcare
- Elevance
- Aetna
- Blue Cross Blue Shield of Michigan
- HCSC
- Alliant Health Plans
- Aspirus Health Plan
- Blue Cross and Blue Shield of Kansas City
- +4 more carriersWith a free account
Plan types Dr. Diaz accepts, by number of carriers
- PPO7
- HMO6
- EPO3
- Medicare2
- POS2
Source: Dmand AI Insurance Network Data
Sources for Dr. Sabrina Grassl Diaz'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)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| 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. Sabrina Grassl Diaz
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. Sabrina Grassl Diaz's NPI number?
Dr. Sabrina Grassl Diaz's NPI number is 1609800622. It was assigned on July 10, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Sabrina Grassl Diaz?
Dr. Sabrina Grassl Diaz is an emergency medicine physician in Santa Monica, California. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Dr. Sabrina Grassl Diaz practice?
Dr. Diaz practices at 2121 Santa Monica Blvd, Santa Monica, CA 90404. Dr. Diaz's primary practice is Providence Saint John's Health Center in Santa Monica, California, part of Providence Health & Services. Dmand AI also links Dr. Diaz to 3 group practices and clinics and 2 medical groups.
What is Dr. Sabrina Grassl Diaz's office phone number?
The practice phone on file for Dr. Diaz is (310) 829-5511.
What is Dr. Sabrina Grassl Diaz's medical license number?
Dr. Diaz holds California license A72139.
Which hospitals is Dr. Sabrina Grassl Diaz affiliated with?
Dr. Diaz practices at Providence Saint John's Health Center in Santa Monica, California.
What medical group is Dr. Sabrina Grassl Diaz part of?
Dr. Diaz is linked to Vituity. Dmand AI links Dr. Diaz to 2 more medical groups.
Does Dr. Sabrina Grassl Diaz accept Medicare?
Yes. CMS data shows Dr. Diaz billed Medicare for 1,040 services in 2024, and Dr. Diaz accepts Medicare assignment.
What is Dr. Sabrina Grassl Diaz's MIPS score?
Dr. Diaz's MIPS final score for performance year 2024 is 97 out of 100, reported as part of a group.
How many Medicare patients does Dr. Sabrina Grassl Diaz see?
CMS counts 608 Medicare patients who saw Dr. Diaz in 2024, with an average age of 79.
Show 7 more questionsShow fewer questions
Is Dr. Sabrina Grassl Diaz board certified?
Yes. Dr. Diaz is board certified in emergency medicine by the American Board of Emergency Medicine.
What services does Dr. Sabrina Grassl Diaz bill to Medicare?
In 2024, Dr. Diaz's most billed Medicare services were heart test or procedure (93010), emergency department visit (99285) and critical care (99291).
Where did Dr. Sabrina Grassl Diaz go to medical school?
Dr. Diaz graduated from Saint Louis University School Of Medicine in 1998.
What drugs does Dr. Sabrina Grassl Diaz prescribe most?
In 2024 Medicare Part D data, Dr. Diaz's most prescribed drugs by claims were Cephalexin, Azithromycin and Albuterol Sulfate Hfa.
Has Dr. Sabrina Grassl Diaz received payments from drug or device companies?
CMS Open Payments shows $730 in general payments to Dr. Diaz from 8 companies from 2016 to 2025. The largest total came from Amgen Inc.
How long has Dr. Sabrina Grassl Diaz been practicing?
Dr. Diaz graduated from medical school in 1998, 28 years ago.
What insurance does Dr. Sabrina Grassl Diaz accept?
Dr. Diaz is in network with 12 carriers, including United Healthcare, Elevance and Aetna. PPO plans come from the most carriers, 7. Check the plan with the practice before a visit.
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