Dr. Robert L. Gross Jr., DO
- Medicare services, 2024
- 1,266
- Medicare patients, 2024
- 309
- Part D claims, 2024
- 3,806
- Hospital affiliations
- 1
- Industry payments
- $41
- Practice address
- 6425 Lynch Canyon Dr, Lake Isabella, CA 93240-9726
- Practice phone
- Call (760) 379-8630
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Sienna Wellness Institute
Primary care practice · Lake Isabella, California
Find Dr. Gross' 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. Robert L. Gross Jr. is an internist in Mountain Mesa, California
Dr. Gross practices at Sienna Wellness Institute in Lake Isabella, California.
Dr. Gross' NPI, 1396827358, was assigned on October 19, 2006. Dr. Gross graduated from Michigan State University College Of Osteopathic Medicine in 1998. Dr. Gross holds California license 20A7951.
- NPI
- 1396827358NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4385691898
- NPI enumeration date
- October 19, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (760) 379-8630
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- 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. Robert L. Gross Jr. practices at Sienna Wellness Institute in Lake Isabella, California
Dr. Gross' primary practice is Sienna Wellness Institute, at 6425 Lynch Canyon Dr, Lake Isabella, CA 93240-9726. The practice phone is (760) 379-8630.
- Sienna Wellness Institute6425 Lynch Canyon Dr, Lake Isabella, CA 93240-9726Phone(760) 379-8630
Source: Dmand AI Affiliation Data
Dr. Robert L. Gross Jr. is affiliated with 5 sites of care and 3 medical groups
Dr. Gross' primary practice is Sienna Wellness Institute in Lake Isabella, California. Dr. Gross is also affiliated with Kern Valley Hospital. The medical group on file is Sienna Wellness Institute. Dmand AI also links Dr. Gross to 2 more group practices and clinics, 2 medical groups and 1 skilled nursing facility, each named with a free account.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Robert L. Gross Jr.'s practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Gross practices, 5 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Sienna Wellness Institute | Available with a free account |
| +4 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Robert L. Gross Jr. is one of 16,751 internists in California
Internal medicine is Dr. Gross' primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dmand AI has Dr. Gross' licenses on file in 2 states: California and Michigan.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
- Michigan license
Clinical focus
Dmand AI lists acid reflux, acute diabetes, acute sinusitis, acute skin infection, alzheimer's disease, aneurysm, asthma and atrial fibrillation and flutter among the conditions Dr. Gross treats.
Internists near Dr. Gross
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. Robert L. Gross Jr. billed Medicare for 1,266 services in 2024
CMS data shows 1,266 Medicare services from Dr. Gross across 12 procedure codes in 2024, for 309 Medicare patients. Medicare paid $109,868 for them.
Dr. Gross' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 7152024: 1,15662%
- Other services
- 2023: 02024: 95
- Tests and treatments
- 2023: 02024: 15
Where Dr. Gross' Medicare services took place, 2024
- In an office76861%
- In a facility49839%
Dr. Gross compared with the California median for internists, 2024
- Dr. Gross
- California median
- Medicare services
- 1,266vs 3613.5 times
- Medicare patients
- 309vs 1512.0 times
- Part D claims
- 3,443vs 4218.2 times
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Gross' 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.
Need commercial claims for Dr. Gross?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Gross and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Robert L. Gross Jr. treated 309 Medicare patients in 2024, average age 73
CMS counts 309 Medicare patients who saw Dr. Gross in 2024. The largest group is 65 to 74, with 141 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 38% are also on Medicaid. Their average risk score is 1.49, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Gross' median patient age at 62, with 61% women.
Dr. Gross' Medicare patients by age, 2024
Dr. Gross' Medicare patients by sex, 2024
- Women18961%
- Men12039%
Chronic conditions among Dr. Gross' Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis46%
- COPD37%
- Diabetes37%
- Ischemic heart disease36%
- Heart failure29%
- Anxiety28%
Share of Medicare patients with each condition. A patient can have several.
Dr. Gross' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 62
Patient panel by sex, all payers
- Women61%
- Men38%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Robert L. Gross Jr. wrote 3,806 Medicare Part D claims in 2024
In 2024, Dr. Gross wrote 3,806 Medicare Part D claims for 135 patients. 71% of them were for generic drugs. CMS names the drug for 3,443 of them, across 69 drugs with 11 or more claims each, at $178,725 in total drug cost. In 2023, CMS named 3,406 claims across 76 drugs.
Dr. Gross' Part D claims by kind of drug, 2024
- Generic2,692 claims71%
- Brand-name and other1,114 claims29%
Dr. Gross' 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. Gross' Part D claims, 2024
- Opioids2%77 of 3,806 claims
- Antibiotics3%109 of 3,806 claims
- Antipsychotics, patients 65 and over1%21 of 3,806 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: 3,4062024: 3,4431%
Drugs named by CMS: 69 in 2024, 76 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. Robert L. Gross Jr. takes part in Medicare
Dr. Gross 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. Robert L. Gross Jr. received $41 in industry payments in 2021
CMS Open Payments shows 2 general payments to Dr. Gross from 2 drug and device companies in 2021. Food and beverage make up the largest share, 100% of the total. Abbvie Inc. paid the most, $28.
Companies that paid Dr. Gross the most, 2021 to 2021
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Robert L. Gross Jr. has 1 award and honors on record
Dmand AI lists 1 award for Dr. Gross, most recently CMS Stage 1 EHR in 2013. Dr. Gross serves on Antibiotic Stewardship Committee, Hospital Board and Utilization Review.
Awards and honors for Dr. Gross
- 2013
- CMS Stage 1 EHR
Dr. Gross' committees and leadership roles
- Antibiotic Stewardship CommitteeChairman
- 2015 to present
- Hospital BoardFirst Vice Chair
- 2012 to present
- Utilization ReviewChair
- 2010 to present
- Medical Executive CommitteeSecretary
- 2009 to present
- Board Finance CommitteeChair
- 2008 to present
Source: Dmand AI Professional Profile Data
Dr. Robert L. Gross Jr. graduated from Michigan State University College Of Osteopathic Medicine
Dr. Gross graduated from Michigan State University College Of Osteopathic Medicine in 1998. Dr. Gross is a member of AOA, OPSC and SHM.
- Medical school
Source: Dmand AI Professional Profile Data
Dr. Robert L. Gross Jr. accepts plans from 9 insurance carriers
Dr. Gross is in network with 9 carriers, including Blue Cross Blue Shield of Michigan, United Healthcare and Humana. Medicare plans come from the most carriers, 8. Check the plan with the practice before a visit.
- Blue Cross Blue Shield of Michigan
- United Healthcare
- Humana
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Regence Health Plans
- Blue Cross and Blue Shield of Kansas City
- CMS Medicare
- +1 more carriersWith a free account
Plan types Dr. Gross accepts, by number of carriers
- Medicare8
- PPO6
- HMO3
- POS2
- EPO1
Source: Dmand AI Insurance Network Data
Sources for Dr. Robert L. Gross Jr.'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 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) |
| 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. Robert L. Gross Jr.
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. Robert L. Gross Jr.'s NPI number?
Dr. Robert L. Gross Jr.'s NPI number is 1396827358. It was assigned on October 19, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Robert L. Gross Jr.?
Dr. Robert L. Gross Jr. is an internist in Mountain Mesa, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Robert L. Gross Jr. practice?
Dr. Gross practices at 6425 Lynch Canyon Dr, Lake Isabella, CA 93240-9726. Dr. Gross' primary practice is Sienna Wellness Institute in Lake Isabella, California. Dmand AI also links Dr. Gross to 2 group practices and clinics, 2 medical groups and 1 skilled nursing facility.
What is Dr. Robert L. Gross Jr.'s office phone number?
The practice phone on file for Dr. Gross is (760) 379-8630.
What is Dr. Robert L. Gross Jr.'s medical license number?
Dr. Gross holds California license 20A7951, one of the licenses on file in 2 states.
Which states has Dr. Robert L. Gross Jr. been licensed in?
Dmand AI has state licenses on file for Dr. Gross in California (2001 to 2026) and Michigan (1999 to 2002).
Which hospitals is Dr. Robert L. Gross Jr. affiliated with?
Dr. Gross is affiliated with Kern Valley Hospital.
What medical group is Dr. Robert L. Gross Jr. part of?
Dr. Gross is linked to Sienna Wellness Institute. Dmand AI links Dr. Gross to 2 more medical groups.
Does Dr. Robert L. Gross Jr. accept Medicare?
Yes. CMS data shows Dr. Gross billed Medicare for 1,266 services in 2024, and Dr. Gross accepts Medicare assignment.
How many Medicare patients does Dr. Robert L. Gross Jr. see?
CMS counts 309 Medicare patients who saw Dr. Gross in 2024, with an average age of 73.
Show 6 more questionsShow fewer questions
What services does Dr. Robert L. Gross Jr. bill to Medicare?
In 2024, Dr. Gross' most billed Medicare services were office visit, established patient (99213), hospital inpatient care (99233) and hospital inpatient care (99223).
Where did Dr. Robert L. Gross Jr. go to medical school?
Dr. Gross graduated from Michigan State University College Of Osteopathic Medicine in 1998.
What drugs does Dr. Robert L. Gross Jr. prescribe most?
In 2024 Medicare Part D data, Dr. Gross' most prescribed drugs by claims were Eliquis, Atorvastatin Calcium and Tradjenta.
Has Dr. Robert L. Gross Jr. received payments from drug or device companies?
CMS Open Payments shows $41 in general payments to Dr. Gross from 2 companies from 2021 to 2021. The largest total came from Abbvie Inc.
How long has Dr. Robert L. Gross Jr. been practicing?
Dr. Gross graduated from medical school in 1998, 28 years ago.
What insurance does Dr. Robert L. Gross Jr. accept?
Dr. Gross is in network with 9 carriers, including Blue Cross Blue Shield of Michigan, United Healthcare and Humana. Medicare plans come from the most carriers, 8. Check the plan with the practice before a visit.
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