Dr. Gregory S. Arent, MD
- Medicare services, 2024
- 27
- Medicare patients, 2024
- 16
- Part D claims, 2024
- 644
- Hospital affiliations
- 1
- Medical group
- 1
- Practice address
- 99 Montecillo Rd, San Rafael, CA 94903
- Practice phone
- Call (415) 444-2000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Arent's professional email, personal email and mobile number
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Dr. Gregory S. Arent is a hospitalist in San Rafael, California
Dr. Arent practices at San Rafael Medical Center in San Rafael, California, part of Kaiser Permanente.
Dr. Arent's NPI, 1245314210, was assigned on October 25, 2006. Dr. Arent graduated from UCSF School of Medicine in 1995. Dr. Arent holds California license A62131.
- NPI
- 1245314210NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0143409821
- NPI enumeration date
- October 25, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (415) 444-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 57
- Medical school graduation
- 1995
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Gregory S. Arent practices at San Rafael Medical Center in San Rafael, California
Dr. Arent's primary practice is San Rafael Medical Center, at 99 Montecillo Rd, San Rafael, CA 94903 in Marin County. The practice phone is (415) 444-2000.
- San Rafael Medical Center99 Montecillo Rd, San Rafael, CA 94903 · Marin CountyPhone(415) 444-2000
Source: Dmand AI Affiliation Data
Dr. Gregory S. Arent is affiliated with 1 site of care and 1 medical group
Dr. Arent's primary practice is San Rafael Medical Center in San Rafael, California, part of Kaiser Permanente. The medical group on file is The Permanente Medical Group, Inc.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Gregory S. Arent's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Arent practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| San Rafael Medical Center | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Gregory S. Arent is one of 3,186 hospitalists in California
Hospitalist is Dr. Arent's primary specialty in the NPI Registry, under taxonomy code 208M00000X. Dr. Arent is board certified in hospice and palliative medicine by the American Board of Internal Medicine. Dr. Arent is licensed in California.
Specialties and state licenses
- Hospitalist, CaliforniaPrimary
Clinical focus
Dmand AI lists acute respiratory failure, seizures and sepsis among the conditions Dr. Arent treats.
Hospitalists near Dr. Arent
Counts of hospitalists 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. Gregory S. Arent billed Medicare for 27 services in 2024
CMS data shows 27 Medicare services from Dr. Arent across 1 procedure code in 2024, for 16 Medicare patients. Medicare paid $1,812 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Arent compared with the California median for hospitalists, 2024
- Dr. Arent
- California median
- Medicare services
- 27vs 43094% below
- Medicare patients
- 16vs 20192% below
- Part D claims
- 329vs 694.8 times
Medians across 2,991 hospitalists in California with Dmand AI profiles that report each measure.
Dr. Arent'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. Gregory S. Arent treated 16 Medicare patients in 2024, average age 75
CMS counts 16 Medicare patients who saw Dr. Arent in 2024. 75% of them have high blood pressure. Their average risk score is 1.79, 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. Arent's median patient age at 78, with 49% women.
Chronic conditions among Dr. Arent's Medicare patients, 2024
- High blood pressure75%
Share of Medicare patients with each condition. A patient can have several.
Dr. Arent's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 78
Patient panel by sex, all payers
- Women49%
- Men50%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Gregory S. Arent wrote 644 Medicare Part D claims in 2024
In 2024, Dr. Arent wrote 644 Medicare Part D claims for 216 patients. 89% of them were for generic drugs. CMS names the drug for 329 of them, across 18 drugs with 11 or more claims each, at $4,280 in total drug cost. In 2023, CMS named 247 claims across 14 drugs.
Dr. Arent's Part D claims by kind of drug, 2024
- Generic572 claims89%
- Brand-name59 claims9%
- Other13 claims2%
Dr. Arent'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. Arent's Part D claims, 2024
- Opioids5%33 of 644 claims
- Antibiotics16%103 of 644 claims
- Antipsychotics, patients 65 and over2%15 of 644 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: 2472024: 32933%
Drugs named by CMS: 18 in 2024, 14 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. Gregory S. Arent takes part in Medicare
Dr. Arent 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. Gregory S. Arent graduated from UCSF School of Medicine
Dr. Arent graduated from UCSF School of Medicine in 1995. Dr. Arent is a member of ACP.
- Medical school
- Board certified in hospice and palliative medicine
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. Gregory S. Arent accepts plans from 2 insurance carriers
Dr. Arent 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. Arent accepts, by number of carriers
- EPO1
- HMO1
- Medicare1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. Gregory S. Arent'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) |
| 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. Gregory S. Arent
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. Gregory S. Arent's NPI number?
Dr. Gregory S. Arent's NPI number is 1245314210. It was assigned on October 25, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Gregory S. Arent?
Dr. Gregory S. Arent is a hospitalist in San Rafael, California. The primary specialty in the NPI Registry is Hospitalist Physician (taxonomy code 208M00000X).
Where does Dr. Gregory S. Arent practice?
Dr. Arent practices at 99 Montecillo Rd, San Rafael, CA 94903. Dr. Arent's primary practice is San Rafael Medical Center in San Rafael, California, part of Kaiser Permanente.
What is Dr. Gregory S. Arent's office phone number?
The practice phone on file for Dr. Arent is (415) 444-2000.
What is Dr. Gregory S. Arent's medical license number?
Dr. Arent holds California license A62131.
Which hospitals is Dr. Gregory S. Arent affiliated with?
Dr. Arent practices at San Rafael Medical Center in San Rafael, California.
What medical group is Dr. Gregory S. Arent part of?
Dr. Arent is linked to The Permanente Medical Group, Inc.
Does Dr. Gregory S. Arent accept Medicare?
Yes. CMS data shows Dr. Arent billed Medicare for 27 services in 2024, and Dr. Arent accepts Medicare assignment.
How many Medicare patients does Dr. Gregory S. Arent see?
CMS counts 16 Medicare patients who saw Dr. Arent in 2024, with an average age of 75.
Is Dr. Gregory S. Arent board certified?
Yes. Dr. Arent is board certified in hospice and palliative medicine by the American Board of Internal Medicine.
Show 5 more questionsShow fewer questions
What services does Dr. Gregory S. Arent bill to Medicare?
In 2024, Dr. Arent's most billed Medicare services were hospital inpatient care (99232).
Where did Dr. Gregory S. Arent go to medical school?
Dr. Arent graduated from UCSF School of Medicine in 1995.
What drugs does Dr. Gregory S. Arent prescribe most?
In 2024 Medicare Part D data, Dr. Arent's most prescribed drugs by claims were Atorvastatin Calcium, Oxycodone HCl and Pantoprazole Sodium.
How long has Dr. Gregory S. Arent been practicing?
Dr. Arent graduated from medical school in 1995, 31 years ago.
What insurance does Dr. Gregory S. Arent accept?
Dr. Arent 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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