Dr. John T. Grigg, MD
- Medicare services, 2024
- 3,966
- Medicare patients, 2024
- 201
- Part D claims, 2024
- 4,473
- MIPS score, 2024
- 75
- Hospital affiliations
- 1
- Practice address
- 5611 St, Zephyrhills, FL 33542
- Practice phone
- Call (800) 877-5227
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Laboratory Corporation of America
Zephyrhills, Florida
Find Dr. 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.
Dr. John T. Grigg is an internist in Zephyrhills, Florida
Dr. Grigg practices at Laboratory Corporation of America in Zephyrhills, Florida.
Dr. Grigg's NPI, 1265438352, was assigned on June 23, 2005. Dr. Grigg graduated from New York University School of Medicine in 1976. Dr. Grigg holds Florida license ME003158.
- NPI
- 1265438352NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6507041308
- NPI enumeration date
- June 23, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (800) 877-5227
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 76
- Medical school graduation
- 1976
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John T. Grigg practices at Laboratory Corporation of America in Zephyrhills, Florida
Dr. Grigg's primary practice is Laboratory Corporation of America, at 5611 St, Zephyrhills, FL 33542 in Pasco County. The practice phone is (800) 877-5227.
- Laboratory Corporation of America5611 St, Zephyrhills, FL 33542 · Pasco CountyPhone(800) 877-5227
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. John T. Grigg is affiliated with 5 sites of care
Dr. Grigg's primary practice is Laboratory Corporation of America in Zephyrhills, Florida. Dr. Grigg is also affiliated with Broward Health Coral Springs. Dmand AI also links Dr. Grigg to 2 more home health agencies and 1 physician office, 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. John T. 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 |
|---|---|
| Laboratory Corporation of America | Available with a free account |
| +4 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. John T. Grigg is one of 9,009 internists in Florida
Internal medicine is Dr. Grigg's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Grigg is licensed in Florida.
Specialties and state licenses
- Internal medicine, FloridaPrimary
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. John T. Grigg billed Medicare for 3,966 services in 2024
CMS data shows 3,966 Medicare services from Dr. Grigg across 29 procedure codes in 2024, for 201 Medicare patients. Medicare paid $106,592 for them.
Dr. Grigg's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1,2672024: 1,1718%
- Lab and pathology
- 2023: 1,1922024: 82031%
- Tests and treatments
- 2023: 7772024: 7553%
- Drugs given in the office
- 2023: 5752024: 6157%
- Surgery
- 2023: 6122024: 52914%
- Other services
- 2023: 962024: 7621%
Where Dr. Grigg's Medicare services took place, 2024
- In an office3,84497%
- In a facility1223%
Dr. Grigg compared with the Florida median for internists, 2024
- Dr. Grigg
- Florida median
- Medicare services
- 3,966vs 5557.1 times
- Medicare patients
- 201vs 2157% below
- Part D claims
- 3,819vs 4668.2 times
Medians across 8,488 internists in Florida 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 Florida.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John T. Grigg treated 201 Medicare patients in 2024, average age 78
CMS counts 201 Medicare patients who saw Dr. Grigg in 2024. The largest group is 75 to 84, with 83 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 6% are also on Medicaid. Their average risk score is 1.37, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Grigg's median patient age at 71, with 50% women.
Dr. Grigg's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Grigg's Medicare patients by sex, 2024
- Women12060%
- Men8140%
Chronic conditions among Dr. Grigg's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis59%
- Diabetes55%
- COPD36%
- Ischemic heart disease30%
- Anxiety19%
- Mood disorders18%
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 71
Patient panel by sex, all payers
- Women50%
- Men48%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. John T. Grigg wrote 4,473 Medicare Part D claims in 2024
In 2024, Dr. Grigg wrote 4,473 Medicare Part D claims for 312 patients. 91% of them were for generic drugs. CMS names the drug for 3,819 of them, across 93 drugs with 11 or more claims each, at $168,586 in total drug cost. In 2023, CMS named 3,666 claims across 89 drugs.
Dr. Grigg's Part D claims by kind of drug, 2024
- Generic4,069 claims91%
- Brand-name392 claims9%
- Other12 claims0%
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
- Opioids4%193 of 4,473 claims
- Antibiotics8%368 of 4,473 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: 3,6662024: 3,8194%
Drugs named by CMS: 93 in 2024, 89 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. John T. Grigg scored 75 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 75 out of 100 for Dr. Grigg for performance year 2024, reported individually. 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
- MIPS final score, 2024
- 75 of 100
Skin biopsy: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026; and Doctors and Clinicians Utilization Data (CMS)
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Dr. John T. Grigg received $7,102 in industry payments from 2016 to 2025
CMS Open Payments shows 110 general payments to Dr. Grigg from 25 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 99% of the total. AstraZeneca Pharmaceuticals LP paid the most, $1,727.
General payments to Dr. Grigg by program year, 2016 to 2025
General payments to Dr. Grigg by kind, 2016 to 2025
- Food and beverage$6,99999%
- Education$1041%
Companies that paid Dr. Grigg the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. John T. Grigg graduated from New York University School of Medicine
Dr. Grigg graduated from New York University School of Medicine in 1976.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. John T. 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 | 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 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)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (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 |
| 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. John T. 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. John T. Grigg's NPI number?
Dr. John T. Grigg's NPI number is 1265438352. It was assigned on June 23, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. John T. Grigg?
Dr. John T. Grigg is an internist in Zephyrhills, Florida. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. John T. Grigg practice?
Dr. Grigg practices at 5611 St, Zephyrhills, FL 33542. Dr. Grigg's primary practice is Laboratory Corporation of America in Zephyrhills, Florida. Dmand AI also links Dr. Grigg to 2 home health agencies and 1 physician office.
What is Dr. John T. Grigg's office phone number?
The practice phone on file for Dr. Grigg is (800) 877-5227.
What is Dr. John T. Grigg's medical license number?
Dr. Grigg holds Florida license ME003158.
Which hospitals is Dr. John T. Grigg affiliated with?
Dr. Grigg is affiliated with Broward Health Coral Springs.
Does Dr. John T. Grigg accept Medicare?
Yes. CMS data shows Dr. Grigg billed Medicare for 3,966 services in 2024, and Dr. Grigg accepts Medicare assignment.
Does Dr. John T. Grigg offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Grigg as offering telehealth services.
What is Dr. John T. Grigg's MIPS score?
Dr. Grigg's MIPS final score for performance year 2024 is 75 out of 100, reported individually.
How many Medicare patients does Dr. John T. Grigg see?
CMS counts 201 Medicare patients who saw Dr. Grigg in 2024, with an average age of 78.
Show 5 more questionsShow fewer questions
What services does Dr. John T. Grigg bill to Medicare?
In 2024, Dr. Grigg's most billed Medicare services were infusion or chemotherapy administration (96372), office visit, established patient (99213) and injected or infused drug (J1100).
Where did Dr. John T. Grigg go to medical school?
Dr. Grigg graduated from New York University School of Medicine in 1976.
What drugs does Dr. John T. Grigg prescribe most?
In 2024 Medicare Part D data, Dr. Grigg's most prescribed drugs by claims were Amlodipine Besylate, Atorvastatin Calcium and Levothyroxine Sodium.
Has Dr. John T. Grigg received payments from drug or device companies?
CMS Open Payments shows $7,102 in general payments to Dr. Grigg from 25 companies from 2016 to 2025. The largest total came from AstraZeneca Pharmaceuticals LP.
How long has Dr. John T. Grigg been practicing?
Dr. Grigg graduated from medical school in 1976, 50 years ago.
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