Dr. Zachary Daniel Grunwald, MD
- Medicare services, 2024
- 1,109
- Medicare patients, 2024
- 609
- Part D claims, 2024
- 412
- Publications
- 1
- MIPS score, 2024
- 100
- Practice address
- 350 Hawthorne Avenue, Oakland, CA 94609
- Practice phone
- Call (510) 655-4000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Grunwald's professional email, personal email and mobile number
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Dr. Zachary Daniel Grunwald is an emergency medicine physician in Oakland, California
Dr. Grunwald practices at Alta Bates Summit Medical Center in Oakland, California, part of Sutter Health.
Dr. Grunwald's NPI, 1306407077, was assigned on June 24, 2019. Dr. Grunwald graduated from Yale School of Medicine in 2019. Dr. Grunwald's Pennsylvania license number on file is MT217599.
- NPI
- 1306407077NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5991031437
- NPI enumeration date
- June 24, 2019
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (510) 655-4000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 33
- Medical school graduation
- 2019
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Zachary Daniel Grunwald practices at Alta Bates Summit Medical Center in Oakland, California
Dr. Grunwald's primary practice is Alta Bates Summit Medical Center, at 350 Hawthorne Avenue, Oakland, CA 94609 in Alameda County. The practice phone is (510) 655-4000.
- Alta Bates Summit Medical Center350 Hawthorne Avenue, Oakland, CA 94609 · Alameda CountyPhone(510) 655-4000
Source: Dmand AI Affiliation Data
Dr. Zachary Daniel Grunwald is affiliated with 2 sites of care and 1 medical group
Dr. Grunwald's primary practice is Alta Bates Summit Medical Center in Oakland, California, part of Sutter Health. Dr. Grunwald is also affiliated with Alta Bates Summit Medical Center | Alta Bates Campus. The medical group on file is Berkeley Emergency Medical Group (BEMG).
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Zachary Daniel Grunwald's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Grunwald practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Alta Bates Summit 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. Zachary Daniel Grunwald is one of 7,423 emergency medicine physicians in California
Emergency medicine is Dr. Grunwald's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dr. Grunwald is board certified in emergency medicine by the American Board of Emergency Medicine. Dmand AI has Dr. Grunwald's licenses on file in 2 states: Pennsylvania and California.
Specialties and state licenses
- Emergency medicine, PennsylvaniaPrimary
- California license
Emergency medicine physicians near Dr. Grunwald
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. Zachary Daniel Grunwald billed Medicare for 1,109 services in 2024
CMS data shows 1,109 Medicare services from Dr. Grunwald across 8 procedure codes in 2024, for 609 Medicare patients. Medicare paid $91,538 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Grunwald's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 5482024: 63816%
- Tests and treatments
- 2023: 4502024: 4715%
Dr. Grunwald compared with the California median for emergency medicine physicians, 2024
- Dr. Grunwald
- California median
- Medicare services
- 1,109vs 2654.2 times
- Medicare patients
- 609vs 2432.5 times
- Part D claims
- 259vs 624.2 times
Medians across 7,079 emergency medicine physicians in California with Dmand AI profiles that report each measure.
Dr. Grunwald'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. Zachary Daniel Grunwald treated 609 Medicare patients in 2024, average age 74
CMS counts 609 Medicare patients who saw Dr. Grunwald in 2024. The largest group is 75 to 84, with 211 patients. 75% of them have high blood pressure, and 69% have high cholesterol. 55% are also on Medicaid. Their average risk score is 2.15, 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. Grunwald's median patient age at 46, with 59% women.
Dr. Grunwald's Medicare patients by age, 2024
Dr. Grunwald's Medicare patients by sex, 2024
- Women31952%
- Men29048%
Chronic conditions among Dr. Grunwald's Medicare patients, 2024
- High blood pressure75%
- High cholesterol69%
- Arthritis45%
- Mood disorders39%
- Chronic kidney disease38%
- Depression34%
- Diabetes34%
- Heart failure33%
Share of Medicare patients with each condition. A patient can have several.
Dr. Grunwald's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 46
Patient panel by sex, all payers
- Women59%
- Men38%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Zachary Daniel Grunwald wrote 412 Medicare Part D claims in 2024
In 2024, Dr. Grunwald wrote 412 Medicare Part D claims for 253 patients. 92% of them were for generic drugs. CMS names the drug for 259 of them, across 9 drugs with 11 or more claims each, at $1,060 in total drug cost. In 2023, CMS named 213 claims across 10 drugs.
Dr. Grunwald's Part D claims by kind of drug, 2024
- Generic381 claims92%
- Brand-name and other31 claims8%
Dr. Grunwald'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. Grunwald's Part D claims, 2024
- Opioids9%36 of 412 claims
- Antibiotics25%105 of 412 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: 2132024: 25922%
Drugs named by CMS: 9 in 2024, 10 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. Zachary Daniel Grunwald scored 100 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 100 out of 100 for Dr. Grunwald for performance year 2024, reported as part of a group. Dr. Grunwald accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Grunwald's MIPS scores, performance year 2024
- 100of 100Final score
- 96.6of 100Quality
- 40of 100Improvement Activities
- 82of 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. Zachary Daniel Grunwald has 1 publication on record
Dmand AI links 1 paper to Dr. Grunwald.
Recent publications by Dr. Grunwald
See who Dr. Grunwald researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Grunwald works with, so you can find a warm path to the right emergency medicine physicians.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Zachary Daniel Grunwald graduated from Yale School of Medicine
Dr. Grunwald graduated from Yale School of Medicine in 2019.
- Medical school
- Board certified in emergency medicine
Source: Dmand AI Professional Profile Data
Dr. Zachary Daniel Grunwald accepts plans from 1 insurance carrier
Dr. Grunwald is in network with 1 carrier, including CMS Medicare. Medicare plans come from the most carriers, 1. Check the plan with the practice before a visit.
- CMS Medicare
Source: Dmand AI Insurance Network Data
Sources for Dr. Zachary Daniel Grunwald'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) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| 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. Zachary Daniel Grunwald
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. Zachary Daniel Grunwald's NPI number?
Dr. Zachary Daniel Grunwald's NPI number is 1306407077. It was assigned on June 24, 2019, and it is active in the NPI Registry.
What kind of doctor is Dr. Zachary Daniel Grunwald?
Dr. Zachary Daniel Grunwald is an emergency medicine physician in Oakland, California. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Dr. Zachary Daniel Grunwald practice?
Dr. Grunwald practices at 350 Hawthorne Avenue, Oakland, CA 94609. Dr. Grunwald's primary practice is Alta Bates Summit Medical Center in Oakland, California, part of Sutter Health.
What is Dr. Zachary Daniel Grunwald's office phone number?
The practice phone on file for Dr. Grunwald is (510) 655-4000.
What is Dr. Zachary Daniel Grunwald's medical license number?
Dr. Grunwald's Pennsylvania license number on file is MT217599, one of the licenses on file in 2 states.
Which states has Dr. Zachary Daniel Grunwald been licensed in?
Dmand AI has state licenses on file for Dr. Grunwald in Pennsylvania (2019 to 2022) and California (2022 to 2026).
Which hospitals is Dr. Zachary Daniel Grunwald affiliated with?
Dr. Grunwald practices at Alta Bates Summit Medical Center in Oakland, California. Dr. Grunwald is also affiliated with Alta Bates Summit Medical Center | Alta Bates Campus.
What medical group is Dr. Zachary Daniel Grunwald part of?
Dr. Grunwald is linked to Berkeley Emergency Medical Group (BEMG).
Does Dr. Zachary Daniel Grunwald accept Medicare?
Yes. CMS data shows Dr. Grunwald billed Medicare for 1,109 services in 2024, and Dr. Grunwald accepts Medicare assignment.
What is Dr. Zachary Daniel Grunwald's MIPS score?
Dr. Grunwald's MIPS final score for performance year 2024 is 100 out of 100, reported as part of a group.
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How many Medicare patients does Dr. Zachary Daniel Grunwald see?
CMS counts 609 Medicare patients who saw Dr. Grunwald in 2024, with an average age of 74.
Is Dr. Zachary Daniel Grunwald board certified?
Yes. Dr. Grunwald is board certified in emergency medicine by the American Board of Emergency Medicine.
What services does Dr. Zachary Daniel Grunwald bill to Medicare?
In 2024, Dr. Grunwald's most billed Medicare services were heart test or procedure (93010), emergency department visit (99285) and emergency department visit (99284).
Where did Dr. Zachary Daniel Grunwald go to medical school?
Dr. Grunwald graduated from Yale School of Medicine in 2019.
What drugs does Dr. Zachary Daniel Grunwald prescribe most?
In 2024 Medicare Part D data, Dr. Grunwald's most prescribed drugs by claims were Ibuprofen, Ondansetron ODT and Amoxicillin-Clavulanate Potass.
How long has Dr. Zachary Daniel Grunwald been practicing?
Dr. Grunwald graduated from medical school in 2019, 7 years ago.
Does Dr. Zachary Daniel Grunwald do research?
Dmand AI links 1 publication to Dr. Grunwald.
What insurance does Dr. Zachary Daniel Grunwald accept?
Dr. Grunwald is in network with 1 carrier, including CMS Medicare. Medicare plans come from the most carriers, 1. Check the plan with the practice before a visit.
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