Robert Douglas Grigg, PA
- Medicare services, 2024
- 4,496
- Medicare patients, 2024
- 498
- Part D claims, 2024
- 8,275
- Hospital affiliations
- 3
- Industry payments
- $2,367
- Practice address
- 15630 18th Ave - Hwy 53, Clearlake, CA 95422
- Practice phone
- Call (707) 994-6486
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Robert Grigg'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.
Robert Douglas Grigg is a physician assistant in Clearlake, California
Robert Grigg practices at Adventist Health Clear Lake in Clearlake, California, part of Adventist Health.
Robert Grigg's NPI, 1407371941, was assigned on August 5, 2017. Robert Grigg holds California license 55070.
- NPI
- 1407371941NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2163789058
- NPI enumeration date
- August 5, 2017
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (707) 994-6486
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 35
- Medical school graduation
- 2017
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Robert Douglas Grigg practices at Adventist Health Clear Lake in Clearlake, California
Robert Grigg's primary practice is Adventist Health Clear Lake, at 15630 18th Ave - Hwy 53, Clearlake, CA 95422 in Lake County. The practice phone is (707) 994-6486.
- Adventist Health Clear Lake15630 18th Ave - Hwy 53, Clearlake, CA 95422 · Lake CountyPhone(707) 994-6486
Source: Dmand AI Affiliation Data
Robert Douglas Grigg is affiliated with 7 sites of care and 4 medical groups
Robert Grigg's primary practice is Adventist Health Clear Lake in Clearlake, California, part of Adventist Health. Robert Grigg is also affiliated with Oroville Hospital. The medical group on file is Adventist Health Clear Lake. Dmand AI also links Robert Grigg to 1 more hospital, 3 medical groups, 2 group practices and clinics and 2 home health agencies, each named with a free account. Robert Grigg's employer is on file too: a hospital.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Robert Douglas Grigg's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Robert Grigg practices, 7 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Adventist Health Clear Lake | Available with a free account |
| +6 more sites and 3 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Adventist Health and 6.2K+ hospitals, with verified contacts in the same login.
Robert Douglas Grigg is one of 11,482 physician assistants in California
Physician assistant is Robert Grigg's primary specialty in the NPI Registry, under taxonomy code 363A00000X. Robert Grigg is licensed in California.
Specialties and state licenses
- Physician assistant, CaliforniaPrimary
Clinical focus
Dmand AI lists acute gastroduodenitis, acute sinusitis, acute skin infection, ADHD, alcohol use disorders, ankle or foot injury, anxiety and arthritis among the conditions Robert Grigg treats.
Physician assistants near Robert Grigg
Counts of physician assistants 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
Robert Douglas Grigg billed Medicare for 4,496 services in 2024
CMS data shows 4,496 Medicare services from Robert Grigg across 37 procedure codes in 2024, for 498 Medicare patients. Medicare paid $201,874 for them. Every service was in an office.
Robert Grigg's Medicare services by type, 2024
- Office and hospital visits2,379
- Other services945
- Tests and treatments529
- Drugs given in the office457
- Lab and pathology127
- Surgery59
Robert Grigg compared with the California median for physician assistants, 2024
- Robert Grigg
- California median
- Medicare services
- 4,496vs 20422.0 times
- Medicare patients
- 498vs 1054.7 times
- Part D claims
- 7,340vs 24330.2 times
Medians across 7,065 physician assistants in California with Dmand AI profiles that report each measure.
Robert Grigg'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.
Need commercial claims for Robert Grigg?
Medicare shows one payer. Book a meeting to get commercial claims data for Robert Grigg and other physician assistants in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Robert Douglas Grigg treated 498 Medicare patients in 2024, average age 74
CMS counts 498 Medicare patients who saw Robert Grigg in 2024. The largest group is 65 to 74, with 259 patients. 75% of them have high cholesterol, and 71% have high blood pressure. 3% are also on Medicaid. Their average risk score is 0.95, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Robert Grigg's median patient age at 73, with 56% women.
Robert Grigg's Medicare patients by age, 2024
Robert Grigg's Medicare patients by sex, 2024
- Women27655%
- Men22245%
Chronic conditions among Robert Grigg's Medicare patients, 2024
- High cholesterol75%
- High blood pressure71%
- Arthritis42%
- Chronic kidney disease34%
- Diabetes28%
- Anxiety27%
- Mood disorders24%
- Depression23%
Share of Medicare patients with each condition. A patient can have several.
Robert Grigg's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 73
Patient panel by sex, all payers
- Women56%
- Men44%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Robert Douglas Grigg wrote 8,275 Medicare Part D claims in 2024
In 2024, Robert Grigg wrote 8,275 Medicare Part D claims for 606 patients. 86% of them were for generic drugs. CMS names the drug for 7,340 of them, across 145 drugs with 11 or more claims each, at $699,885 in total drug cost.
Robert Grigg's Part D claims by kind of drug, 2024
- Generic7,140 claims86%
- Brand-name1,099 claims13%
- Other36 claims0%
Robert Grigg'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 Robert Grigg's Part D claims, 2024
- Opioids6%521 of 8,275 claims
- Antibiotics4%325 of 8,275 claims
- Antipsychotics, patients 65 and over0%31 of 8,275 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
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
Robert Douglas Grigg offers telehealth to Medicare patients
Robert Grigg accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Robert Grigg as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Robert Douglas Grigg received $2,367 in industry payments from 2024 to 2025
CMS Open Payments shows 135 general payments to Robert Grigg from 21 drug and device companies from 2024 to 2025. Food and beverage make up the largest share, 99% of the total. Abbvie Inc. paid the most, $470.
General payments to Robert Grigg by program year, 2024 to 2025
General payments to Robert Grigg by kind, 2024 to 2025
- Food and beverage$2,33599%
- Education$321%
Companies that paid Robert Grigg the most, 2024 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Robert Douglas Grigg'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) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| 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 Robert Douglas Grigg
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Robert Douglas Grigg's NPI number?
Robert Douglas Grigg's NPI number is 1407371941. It was assigned on August 5, 2017, and it is active in the NPI Registry.
What does Robert Douglas Grigg specialize in?
Robert Douglas Grigg is a physician assistant in Clearlake, California. The primary specialty in the NPI Registry is Physician Assistant (taxonomy code 363A00000X).
Where does Robert Douglas Grigg practice?
Robert Grigg practices at 15630 18th Ave - Hwy 53, Clearlake, CA 95422. Robert Grigg's primary practice is Adventist Health Clear Lake in Clearlake, California, part of Adventist Health. Dmand AI also links Robert Grigg to 1 hospital, 3 medical groups, 2 group practices and clinics and 2 home health agencies.
What is Robert Douglas Grigg's office phone number?
The practice phone on file for Robert Grigg is (707) 994-6486.
What is Robert Douglas Grigg's medical license number?
Robert Grigg holds California license 55070.
Which hospitals is Robert Douglas Grigg affiliated with?
Robert Grigg practices at Adventist Health Clear Lake in Clearlake, California. Robert Grigg is also affiliated with Oroville Hospital. Dmand AI links Robert Grigg to 1 more hospital.
What medical group is Robert Douglas Grigg part of?
Robert Grigg is linked to Adventist Health Clear Lake. Dmand AI links Robert Grigg to 3 more medical groups.
Does Robert Douglas Grigg accept Medicare?
Yes. CMS data shows Robert Grigg billed Medicare for 4,496 services in 2024, and Robert Grigg accepts Medicare assignment.
Does Robert Douglas Grigg offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Robert Grigg as offering telehealth services.
How many Medicare patients does Robert Douglas Grigg see?
CMS counts 498 Medicare patients who saw Robert Grigg in 2024, with an average age of 74.
Show 4 more questionsShow fewer questions
What services does Robert Douglas Grigg bill to Medicare?
In 2024, Robert Grigg's most billed Medicare services were office visit, established patient (99214), medicare service (G2211) and care management and other visits (99442).
What drugs does Robert Douglas Grigg prescribe most?
In 2024 Medicare Part D data, Robert Grigg's most prescribed drugs by claims were Hydrocodone-Acetaminophen, Levothyroxine Sodium and Atorvastatin Calcium.
Has Robert Douglas Grigg received payments from drug or device companies?
CMS Open Payments shows $2,367 in general payments to Robert Grigg from 21 companies from 2024 to 2025. The largest total came from Abbvie Inc.
How long has Robert Douglas Grigg been practicing?
Robert Grigg graduated from medical school in 2017, 9 years ago.
Selling to physician assistant practices?
See physician assistants in California by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card