Dr. Gregory Lambourne, MD
- Medicare services, 2021
- 387
- Part D claims, 2024
- 275
- Hospital affiliations
- 1
- Industry payments
- $1,637
- Medical groups
- 3
- Practice address
- 1100 E Michigan Ave, Grayling, MI 49738
- Practice phone
- Call (989) 348-5461
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
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Dr. Gregory Lambourne is an internist in Grayling, Michigan
Dr. Lambourne practices at Munson Healthcare Grayling Hospital in Grayling, Michigan, part of Munson Healthcare.
Dr. Lambourne's NPI, 1598775850, was assigned on August 9, 2006. Dr. Lambourne graduated from Wayne State University School of Medicine in 1975. Dr. Lambourne holds Michigan license 4301036909.
- NPI
- 1598775850NPI Registry (opens in a new tab)
- NPI enumeration date
- August 9, 2006
- NPI status
- Active
- Practice phone
- (989) 348-5461
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 77
- Medical school graduation
- 1975
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Gregory Lambourne practices at Munson Healthcare Grayling Hospital in Grayling, Michigan
Dr. Lambourne's primary practice is Munson Healthcare Grayling Hospital, at 1100 E Michigan Ave, Grayling, MI 49738 in Crawford County. The practice phone is (989) 348-5461.
- Munson Healthcare Grayling Hospital1100 E Michigan Ave, Grayling, MI 49738 · Crawford CountyPhone(989) 348-5461
Source: Dmand AI Affiliation Data
Dr. Gregory Lambourne is affiliated with 3 sites of care and 3 medical groups
Dr. Lambourne's primary practice is Munson Healthcare Grayling Hospital in Grayling, Michigan, part of Munson Healthcare. The medical group on file is Lake City Primary Care. Dmand AI also links Dr. Lambourne to 2 more medical groups, 1 hospice and 1 rural health clinic, 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. Gregory Lambourne's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Lambourne practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Munson Healthcare Grayling Hospital | Available with a free account |
| +2 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Gregory Lambourne is one of 4,804 internists in Michigan
Internal medicine is Dr. Lambourne's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Lambourne is licensed in Michigan.
Specialties and state licenses
- Internal medicine, MichiganPrimary
Internists near Dr. Lambourne
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. Gregory Lambourne billed Medicare for 387 services in 2021
CMS data shows 387 Medicare services from Dr. Lambourne across 1 procedure code in 2021. Medicare paid $2,311 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Lambourne's Medicare services by type, 2020 to 2021
- 2020
- 2021
- Tests and treatments
- 2020: 7522021: 38749%
- Other services
- 2020: 302021: 0100%
- Surgery
- 2020: 382021: 0100%
- Office and hospital visits
- 2020: 382021: 0100%
Dr. Lambourne compared with the Michigan median for internists, 2021
- Dr. Lambourne
- Michigan median
- Medicare services
- 387vs 4239% below
- Part D claims
- 85vs 31473% below
Medians across 4,524 internists in Michigan with Dmand AI profiles that report each measure.
Dr. Lambourne's most billed Medicare procedure codes, 2021
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. Lambourne and other internists in Michigan.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gregory Lambourne's patients have a median age of 75
Across all payers, Dmand AI patient panel data puts Dr. Lambourne's median patient age at 75, with 51% women.
Dr. Lambourne's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 75
Patient panel by sex, all payers
- Women51%
- Men49%
Source: Dmand AI Patient Panel Data
Dr. Gregory Lambourne wrote 275 Medicare Part D claims in 2024
In 2024, Dr. Lambourne wrote 275 Medicare Part D claims for 78 patients. 86% of them were for generic drugs. CMS names the drug for 85 of them, across 6 drugs with 11 or more claims each, at $9,738 in total drug cost. In 2022, CMS named 88 claims across 6 drugs.
Dr. Lambourne's Part D claims by kind of drug, 2024
- Generic237 claims86%
- Brand-name38 claims14%
Dr. Lambourne'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. Lambourne's Part D claims, 2024
- Opioids5%14 of 275 claims
- Antibiotics5%14 of 275 claims
- Antipsychotics, patients 65 and over4%11 of 275 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, 2022 to 2024
- 2022
- 2024
- Claims for drugs CMS names
- 2022: 882024: 853%
Drugs named by CMS: 6 in 2024, 6 in 2022.
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. Gregory Lambourne received $1,637 in industry payments from 2016 to 2023
CMS Open Payments shows 111 general payments to Dr. Lambourne from 24 drug and device companies from 2016 to 2023. Food and beverage make up the largest share, 100% of the total. AstraZeneca Pharmaceuticals LP paid the most, $228.
General payments to Dr. Lambourne by program year, 2016 to 2023
Companies that paid Dr. Lambourne the most, 2016 to 2023
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Gregory Lambourne graduated from Wayne State University School of Medicine
Dr. Lambourne graduated from Wayne State University School of Medicine in 1975.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Gregory Lambourne'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 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 |
| 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. Gregory Lambourne
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. Gregory Lambourne's NPI number?
Dr. Gregory Lambourne's NPI number is 1598775850. It was assigned on August 9, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Gregory Lambourne?
Dr. Gregory Lambourne is an internist in Grayling, Michigan. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Gregory Lambourne practice?
Dr. Lambourne practices at 1100 E Michigan Ave, Grayling, MI 49738. Dr. Lambourne's primary practice is Munson Healthcare Grayling Hospital in Grayling, Michigan, part of Munson Healthcare. Dmand AI also links Dr. Lambourne to 2 medical groups, 1 hospice and 1 rural health clinic.
What is Dr. Gregory Lambourne's office phone number?
The practice phone on file for Dr. Lambourne is (989) 348-5461.
What is Dr. Gregory Lambourne's medical license number?
Dr. Lambourne holds Michigan license 4301036909.
Which hospitals is Dr. Gregory Lambourne affiliated with?
Dr. Lambourne practices at Munson Healthcare Grayling Hospital in Grayling, Michigan.
What medical group is Dr. Gregory Lambourne part of?
Dr. Lambourne is linked to Lake City Primary Care. Dmand AI links Dr. Lambourne to 2 more medical groups.
Does Dr. Gregory Lambourne accept Medicare?
Yes. CMS data shows Dr. Lambourne billed Medicare for 387 services in 2021.
What services does Dr. Gregory Lambourne bill to Medicare?
In 2021, Dr. Lambourne's most billed Medicare services were heart test or procedure (93010).
Where did Dr. Gregory Lambourne go to medical school?
Dr. Lambourne graduated from Wayne State University School of Medicine in 1975.
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What drugs does Dr. Gregory Lambourne prescribe most?
In 2024 Medicare Part D data, Dr. Lambourne's most prescribed drugs by claims were Tamsulosin HCl, Levothyroxine Sodium and Spironolactone.
Has Dr. Gregory Lambourne received payments from drug or device companies?
CMS Open Payments shows $1,637 in general payments to Dr. Lambourne from 24 companies from 2016 to 2023. The largest total came from AstraZeneca Pharmaceuticals LP.
How long has Dr. Gregory Lambourne been practicing?
Dr. Lambourne graduated from medical school in 1975, 51 years ago.
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