Dr. William Nelson Grant III, MD
- Medicare services, 2020
- 276
- Part D claims, 2024
- 43
- Hospital affiliations
- 1
- Industry payments
- $32
- Medical groups
- 6
- Practice address
- 9965 Sierra Ave, Fontana, CA 92335
- Practice phone
- Call (909) 427-5000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Kaiser Permanente - Fontana Medical Center
Fontana, California
Find Dr. Grant's professional email, personal email and mobile number
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Dr. William Nelson Grant III is an internist in Fontana, California
Dr. Grant practices at Kaiser Permanente - Fontana Medical Center in Fontana, California.
Dr. Grant's NPI, 1548277726, was assigned on August 1, 2006. Dr. Grant graduated from Chicago Medical School at Rosalind Franklin University of Medicine and Science in 1979. Dr. Grant's Texas license number on file is P7451.
- NPI
- 1548277726NPI Registry (opens in a new tab)
- NPI enumeration date
- August 1, 2006
- NPI status
- Active
- Practice phone
- (909) 427-5000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Medical school graduation
- 1979
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
Dr. William Nelson Grant III practices at Kaiser Permanente - Fontana Medical Center in Fontana, California
Dr. Grant's primary practice is Kaiser Permanente - Fontana Medical Center, at 9965 Sierra Ave, Fontana, CA 92335 in San Bernardino County. The practice phone is (909) 427-5000.
- Kaiser Permanente - Fontana Medical Center9965 Sierra Ave, Fontana, CA 92335 · San Bernardino CountyPhone(909) 427-5000
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. William Nelson Grant III is affiliated with 2 sites of care and 6 medical groups
Dr. Grant's primary practice is Kaiser Permanente - Fontana Medical Center in Fontana, California. Dr. Grant is also affiliated with Vaughan Regional Medical Center. The medical group on file is Paragon Contracting Services. Dmand AI also links Dr. Grant to 5 more medical groups, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. William Nelson Grant III's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Grant practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Kaiser Permanente - Fontana Medical Center | Available with a free account |
| +1 more site and 5 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. William Nelson Grant III is one of 16,751 internists in California
Internal medicine is Dr. Grant's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dmand AI has Dr. Grant's licenses on file in 9 states: Texas, Florida, Kentucky, New Mexico, Ohio, Alabama, Louisiana, Illinois and Tennessee.
Specialties and state licenses
- Internal medicine, TexasPrimary
- Florida license
- Kentucky license
- New Mexico license
- Ohio license
- Alabama license
- Louisiana license
- Illinois license
- Tennessee license
Internists near Dr. Grant
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 Nelson Grant III billed Medicare for 276 services in 2020
CMS data shows 276 Medicare services from Dr. Grant across 3 procedure codes in 2020. Medicare paid $29,654 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Grant's Medicare services by type, 2019 to 2020
- 2019
- 2020
- Office and hospital visits
- 2019: 4562020: 27639%
Dr. Grant compared with the California median for internists, 2020
- Dr. Grant
- California median
- Medicare services
- 276vs 36124% below
- Part D claims
- 33vs 42192% below
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Grant's most billed Medicare procedure codes, 2020
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. Grant and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. William Nelson Grant III's patients have a median age of 53
Across all payers, Dmand AI patient panel data puts Dr. Grant's median patient age at 53, with 61% women.
Dr. Grant's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 53
Patient panel by sex, all payers
- Women61%
- Men39%
Source: Dmand AI Patient Panel Data
Dr. William Nelson Grant III wrote 43 Medicare Part D claims in 2024
In 2024, Dr. Grant wrote 43 Medicare Part D claims for 12 patients. 70% of them were for generic drugs. CMS names the drug for 33 of them, across 2 drugs with 11 or more claims each, at $141 in total drug cost. In 2021, CMS named 63 claims across 2 drugs.
Dr. Grant's Part D claims by kind of drug, 2024
- Generic30 claims70%
- Brand-name13 claims30%
Dr. Grant's most prescribed drugs by claims, 2022
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2021 to 2022
- 2021
- 2022
- Claims for drugs CMS names
- 2021: 632022: 3348%
Drugs named by CMS: 2 in 2022, 2 in 2021.
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
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Dr. William Nelson Grant III received $32 in industry payments in 2016
CMS Open Payments shows 2 general payments to Dr. Grant from 1 drug or device company in 2016. Food and beverage make up the largest share, 100% of the total. The Medicines Company paid the most, $32.
Companies that paid Dr. Grant the most, 2016 to 2016
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. William Nelson Grant III graduated from Chicago Medical School at Rosalind Franklin University of Medicine and Science
Dr. Grant graduated from Chicago Medical School at Rosalind Franklin University of Medicine and Science in 1979.
- Medical school
Source: Dmand AI Professional Profile Data
Dr. William Nelson Grant III accepts plans from 3 insurance carriers
Dr. Grant is in network with 3 carriers, including Elevance, Blue Cross Blue Shield of Michigan and GA State Medicaid. HMO plans come from the most carriers, 2. Check the plan with the practice before a visit.
- Elevance
- Blue Cross Blue Shield of Michigan
- GA State Medicaid
Plan types Dr. Grant accepts, by number of carriers
- HMO2
- POS2
- PPO2
- EPO1
- Medicaid1
- Medicare1
Source: Dmand AI Insurance Network Data
Sources for Dr. William Nelson Grant III'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand 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 Data |
| 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) |
| Industry payments | Open Payments (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. William Nelson Grant III
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 Nelson Grant III's NPI number?
Dr. William Nelson Grant III's NPI number is 1548277726. It was assigned on August 1, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. William Nelson Grant III?
Dr. William Nelson Grant III is an internist in Fontana, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. William Nelson Grant III practice?
Dr. Grant practices at 9965 Sierra Ave, Fontana, CA 92335. Dr. Grant's primary practice is Kaiser Permanente - Fontana Medical Center in Fontana, California. Dmand AI also links Dr. Grant to 5 medical groups.
What is Dr. William Nelson Grant III's office phone number?
The practice phone on file for Dr. Grant is (909) 427-5000.
What is Dr. William Nelson Grant III's medical license number?
Dr. Grant's Texas license number on file is P7451, one of the licenses on file in 9 states.
Which states has Dr. William Nelson Grant III been licensed in?
Dmand AI has state licenses on file for Dr. Grant in Texas (2013 to 2025), Florida (2015 to 2027), Kentucky (2024 to 2025), New Mexico (2014 to 2022), Ohio (2001 to 2021), Alabama (1992 to 2020), Louisiana (1983 to 2006), Illinois (1980 to 1990) and Tennessee (1982 to 1983).
Which hospitals is Dr. William Nelson Grant III affiliated with?
Dr. Grant is affiliated with Vaughan Regional Medical Center.
What medical group is Dr. William Nelson Grant III part of?
Dr. Grant is linked to Paragon Contracting Services. Dmand AI links Dr. Grant to 5 more medical groups.
Does Dr. William Nelson Grant III accept Medicare?
Yes. CMS data shows Dr. Grant billed Medicare for 276 services in 2020.
What services does Dr. William Nelson Grant III bill to Medicare?
In 2020, Dr. Grant's most billed Medicare services were emergency department visit (99285), emergency department visit (99284) and emergency department visit (99283).
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Where did Dr. William Nelson Grant III go to medical school?
Dr. Grant graduated from Chicago Medical School at Rosalind Franklin University of Medicine and Science in 1979.
What drugs does Dr. William Nelson Grant III prescribe most?
In 2022 Medicare Part D data, Dr. Grant's most prescribed drugs by claims were Prednisone and Azithromycin.
Has Dr. William Nelson Grant III received payments from drug or device companies?
CMS Open Payments shows $32 in general payments to Dr. Grant from 1 company from 2016 to 2016. The largest total came from The Medicines Company.
How long has Dr. William Nelson Grant III been practicing?
Dr. Grant graduated from medical school in 1979, 47 years ago.
What insurance does Dr. William Nelson Grant III accept?
Dr. Grant is in network with 3 carriers, including Elevance, Blue Cross Blue Shield of Michigan and GA State Medicaid. HMO plans come from the most carriers, 2. Check the plan with the practice before a visit.
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