Dr. William Spencer Grigg, DO
- Medicare services, 2024
- 66
- Medicare patients, 2024
- 94
- Part D claims, 2024
- 429
- Publications
- 1
- Hospital affiliations
- 2
- Practice address
- 1800 N California St, Stockton, CA 95204
- Practice phone
- Call (209) 943-2000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Dr. Grigg's professional email, personal email and mobile number
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Dr. William Spencer Grigg is an internist in Stockton, California
Dr. Grigg practices at Dignity Health - St. Joseph's Medical Center in Stockton, California, part of CommonSpirit Health.
Dr. Grigg's NPI, 1578050266, was assigned on April 18, 2018. Dr. Grigg holds Colorado license DR.0062850.
- NPI
- 1578050266NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9234476300
- NPI enumeration date
- April 18, 2018
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (209) 943-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 34
- Medical school graduation
- 2018
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. William Spencer Grigg practices at Dignity Health - St. Joseph's Medical Center in Stockton, California
Dr. Grigg's primary practice is Dignity Health - St. Joseph's Medical Center, at 1800 N California St, Stockton, CA 95204 in San Joaquin County. The practice phone is (209) 943-2000.
- Dignity Health - St. Joseph's Medical Center1800 N California St, Stockton, CA 95204 · San Joaquin CountyPhone(209) 943-2000
Source: Dmand AI Affiliation Data
Dr. William Spencer Grigg is affiliated with 4 sites of care and 7 medical groups
Dr. Grigg's primary practice is Dignity Health - St. Joseph's Medical Center in Stockton, California, part of CommonSpirit Health. Dr. Grigg is also affiliated with Strong Memorial Hospital. The medical group on file is Signify Health. Dmand AI also links Dr. Grigg to 6 more medical groups and 2 group practices and clinics, 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. William Spencer Grigg's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Grigg practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Dignity Health - St. Joseph's Medical Center | Available with a free account |
| +3 more sites and 6 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. William Spencer Grigg is one of 16,751 internists in California
Internal medicine is Dr. Grigg's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Grigg is licensed in Colorado.
Specialties and state licenses
- Internal medicine, ColoradoPrimary
Internists near Dr. Grigg
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. William Spencer Grigg billed Medicare for 66 services in 2024
CMS data shows 66 Medicare services from Dr. Grigg across 2 procedure codes in 2024, for 94 Medicare patients. Medicare paid $7,906 for them.
Dr. Grigg's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1512024: 6656%
- Tests and treatments
- 2023: 172024: 0100%
Where Dr. Grigg's Medicare services took place, 2024
- In an office1827%
- In a facility4873%
Dr. Grigg compared with the California median for internists, 2024
- Dr. Grigg
- California median
- Medicare services
- 66vs 36182% below
- Medicare patients
- 94vs 15138% below
- Part D claims
- 209vs 42150% below
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. 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.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Grigg and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. William Spencer Grigg treated 94 Medicare patients in 2024, average age 76
CMS counts 94 Medicare patients who saw Dr. Grigg in 2024. The largest group is 75 to 84, with 35 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 31% are also on Medicaid. Their average risk score is 2.04, 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. Grigg's median patient age at 60, with 54% women.
Dr. Grigg's Medicare patients by age, 2024
Dr. Grigg's Medicare patients by sex, 2024
- Women4245%
- Men5255%
Chronic conditions among Dr. Grigg's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis54%
- Ischemic heart disease49%
- Mood disorders45%
- Chronic kidney disease44%
- Diabetes44%
- Heart failure43%
Share of Medicare patients with each condition. A patient can have several.
Dr. 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 60
Patient panel by sex, all payers
- Women54%
- Men46%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. William Spencer Grigg wrote 429 Medicare Part D claims in 2024
In 2024, Dr. Grigg wrote 429 Medicare Part D claims for 147 patients. 79% of them were for generic drugs. CMS names the drug for 209 of them, across 10 drugs with 11 or more claims each, at $37,067 in total drug cost. In 2023, CMS named 463 claims across 19 drugs.
Dr. Grigg's Part D claims by kind of drug, 2024
- Generic337 claims79%
- Brand-name and other92 claims21%
Dr. 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 Dr. Grigg's Part D claims, 2024
- Antibiotics3%15 of 429 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: 4632024: 20955%
Drugs named by CMS: 10 in 2024, 19 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. William Spencer Grigg offers telehealth to Medicare patients
Dr. Grigg accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Grigg as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. William Spencer Grigg has 1 publication on record
Dmand AI links 1 paper to Dr. Grigg in 2021. Dr. Grigg's most frequent co-authors are Dharmista Ramjibhai Chaudhary, MD and Douglas Floyd Duffee, MD.
Dr. Grigg's most frequent co-authors
Recent publications by Dr. Grigg
See who Dr. Grigg researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Grigg works with, so you can find a warm path to the right internists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. William Spencer Grigg received $53,166 in industry payments from 2021 to 2025
CMS Open Payments shows 157 general payments to Dr. Grigg from 16 drug and device companies from 2021 to 2025. Grants make up the largest share, 66% of the total. Medtronic, Inc. paid the most, $24,142.
General payments to Dr. Grigg by program year, 2021 to 2025
General payments to Dr. Grigg by kind, 2021 to 2025
- Grants$35,00066%
- Travel and lodging$11,78122%
- Food and beverage$5,99911%
- Education$3871%
Companies that paid Dr. Grigg the most, 2021 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. William Spencer 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) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| 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 Dr. William Spencer 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 Dr. William Spencer Grigg's NPI number?
Dr. William Spencer Grigg's NPI number is 1578050266. It was assigned on April 18, 2018, and it is active in the NPI Registry.
What kind of doctor is Dr. William Spencer Grigg?
Dr. William Spencer Grigg is an internist in Stockton, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. William Spencer Grigg practice?
Dr. Grigg practices at 1800 N California St, Stockton, CA 95204. Dr. Grigg's primary practice is Dignity Health - St. Joseph's Medical Center in Stockton, California, part of CommonSpirit Health. Dmand AI also links Dr. Grigg to 6 medical groups and 2 group practices and clinics.
What is Dr. William Spencer Grigg's office phone number?
The practice phone on file for Dr. Grigg is (209) 943-2000.
What is Dr. William Spencer Grigg's medical license number?
Dr. Grigg holds Colorado license DR.0062850.
Which hospitals is Dr. William Spencer Grigg affiliated with?
Dr. Grigg practices at Dignity Health - St. Joseph's Medical Center in Stockton, California. Dr. Grigg is also affiliated with Strong Memorial Hospital.
What medical group is Dr. William Spencer Grigg part of?
Dr. Grigg is linked to Signify Health. Dmand AI links Dr. Grigg to 6 more medical groups.
Does Dr. William Spencer Grigg accept Medicare?
Yes. CMS data shows Dr. Grigg billed Medicare for 66 services in 2024, and Dr. Grigg accepts Medicare assignment.
Does Dr. William Spencer Grigg offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Grigg as offering telehealth services.
How many Medicare patients does Dr. William Spencer Grigg see?
CMS counts 94 Medicare patients who saw Dr. Grigg in 2024, with an average age of 76.
Show 6 more questionsShow fewer questions
What services does Dr. William Spencer Grigg bill to Medicare?
In 2024, Dr. Grigg's most billed Medicare services were hospital inpatient care (99223) and office visit, established patient (99214).
What drugs does Dr. William Spencer Grigg prescribe most?
In 2024 Medicare Part D data, Dr. Grigg's most prescribed drugs by claims were Eliquis, Clonazepam and Metoprolol Succinate.
Has Dr. William Spencer Grigg received payments from drug or device companies?
CMS Open Payments shows $53,166 in general payments to Dr. Grigg from 16 companies from 2021 to 2025. The largest total came from Medtronic, Inc.
How long has Dr. William Spencer Grigg been practicing?
Dr. Grigg graduated from medical school in 2018, 8 years ago.
Does Dr. William Spencer Grigg do research?
Dmand AI links 1 publication to Dr. Grigg.
Who does Dr. William Spencer Grigg publish with?
Dr. Grigg's most frequent co-authors are Dharmista Ramjibhai Chaudhary, MD (1 shared paper) and Douglas Floyd Duffee, MD (1 shared paper).
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