Dr. Gregory P. McLennan II, MD
- Medicare services, 2024
- 2,157
- Medicare patients, 2024
- 761
- Part D claims, 2024
- 2,937
- Hospital affiliations
- 5
- Industry payments
- $97,801
- Practice address
- 901 Patients First Dr, Washington, MO 63090
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Mercy Hospital St Louis - Oncology and Hematology Patients First - HOPD
Acute Care Hospital outpatient department · Washington, Missouri
Find Dr. McLennan'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. Gregory P. McLennan II is a urologist in Washington, Missouri
Dr. McLennan practices at Mercy Hospital St Louis - Oncology and Hematology Patients First - HOPD in Washington, Missouri.
Dr. McLennan's NPI, 1912160052, was assigned on July 9, 2008. Dr. McLennan graduated from Saint Louis University School of Medicine in 2008. Dr. McLennan holds Missouri license 2014009247.
- NPI
- 1912160052NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8628209327
- NPI enumeration date
- July 9, 2008
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 44
- Medical school graduation
- 2008
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Gregory P. McLennan II practices at Mercy Hospital St Louis - Oncology and Hematology Patients First - HOPD in Washington, Missouri
Dr. McLennan's primary practice is Mercy Hospital St Louis - Oncology and Hematology Patients First - HOPD, at 901 Patients First Dr, Washington, MO 63090.
- Mercy Hospital St Louis - Oncology and Hematology Patients First - HOPD901 Patients First Dr, Washington, MO 63090
Source: Dmand AI Affiliation Data
Dr. Gregory P. McLennan II is affiliated with 11 sites of care and 4 medical groups
Dr. McLennan's primary practice is Mercy Hospital St Louis - Oncology and Hematology Patients First - HOPD in Washington, Missouri. Dr. McLennan is also affiliated with Mercy Hospital Washington. The medical group on file is Mercy Hospital St. Louis. Dmand AI also links Dr. McLennan to 4 more hospitals, 4 group practices and clinics, 3 medical groups and 1 hospital outpatient department, each named with a free account. Dr. McLennan's employer is on file too: a hospital.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Gregory P. McLennan II's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. McLennan practices, 11 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Mercy Hospital St Louis - Oncology and Hematology Patients First - HOPD | Available with a free account |
| +10 more sites and 3 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Gregory P. McLennan II is one of 246 urologists in Missouri
Urology is Dr. McLennan's primary specialty in the NPI Registry, under taxonomy code 208800000X. Dr. McLennan is licensed in Missouri.
Specialties and state licenses
- Urology, MissouriPrimary
Urologists near Dr. McLennan
Counts of urologists 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 P. McLennan II billed Medicare for 2,157 services in 2024
CMS data shows 2,157 Medicare services from Dr. McLennan across 26 procedure codes in 2024, for 761 Medicare patients. Medicare paid $182,574 for them.
Dr. McLennan's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1,1162024: 1,114No change
- Surgery
- 2023: 5632024: 70125%
- Other services
- 2023: 02024: 163
- Drugs given in the office
- 2023: 1112024: 111No change
- Imaging
- 2023: 302024: 5067%
- Tests and treatments
- 2023: 202024: 1810%
Where Dr. McLennan's Medicare services took place, 2024
- In an office1,95991%
- In a facility1989%
Dr. McLennan compared with the Missouri median for urologists, 2024
- Dr. McLennan
- Missouri median
- Medicare services
- 2,157vs 1,53441% above
- Medicare patients
- 761vs 50052% above
- Part D claims
- 2,809vs 7993.5 times
Medians across 252 urologists in Missouri with Dmand AI profiles that report each measure.
Dr. McLennan'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. McLennan and other urologists in Missouri.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gregory P. McLennan II treated 761 Medicare patients in 2024, average age 74
CMS counts 761 Medicare patients who saw Dr. McLennan in 2024. The largest group is 65 to 74, with 348 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 5% are also on Medicaid. Their average risk score is 1.29, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. McLennan's median patient age at 72, with 22% women.
Dr. McLennan's Medicare patients by age, 2024
Dr. McLennan's Medicare patients by sex, 2024
- Women20227%
- Men55973%
Chronic conditions among Dr. McLennan's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis49%
- Ischemic heart disease36%
- Chronic kidney disease32%
- Cancer31%
- Diabetes29%
- Anxiety24%
Share of Medicare patients with each condition. A patient can have several.
Dr. McLennan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 72
Patient panel by sex, all payers
- Women22%
- Men77%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Gregory P. McLennan II wrote 2,937 Medicare Part D claims in 2024
In 2024, Dr. McLennan wrote 2,937 Medicare Part D claims for 735 patients. 82% of them were for generic drugs. CMS names the drug for 2,809 of them, across 30 drugs with 11 or more claims each, at $392,976 in total drug cost. In 2023, CMS named 2,567 claims across 29 drugs.
Dr. McLennan's Part D claims by kind of drug, 2024
- Generic2,411 claims82%
- Brand-name and other526 claims18%
Dr. McLennan'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. McLennan's Part D claims, 2024
- Opioids10%286 of 2,937 claims
- Antibiotics18%540 of 2,937 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: 2,5672024: 2,8099%
Drugs named by CMS: 30 in 2024, 29 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. Gregory P. McLennan II offers telehealth to Medicare patients
Dr. McLennan accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. McLennan as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Prostate resection: 1 to 10 procedures (CMS shows small counts as a range)
Removal of tissue: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Gregory P. McLennan II received $97,801 in industry payments from 2016 to 2025
CMS Open Payments shows 1,142 general payments to Dr. McLennan from 79 drug and device companies from 2016 to 2025. Consulting fees make up the largest share, 57% of the total. Calyxo, Inc. paid the most, $57,940.
General payments to Dr. McLennan by program year, 2016 to 2025
General payments to Dr. McLennan by kind, 2016 to 2025
- Consulting fees$55,26857%
- Food and beverage$24,61925%
- Travel and lodging$14,21615%
- Speaker and faculty fees$2,6253%
- Other$1,0651%
Companies that paid Dr. McLennan 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. Gregory P. McLennan II graduated from Saint Louis University School of Medicine
Dr. McLennan graduated from Saint Louis University School of Medicine in 2008.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Gregory P. McLennan II'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 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)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. Gregory P. McLennan II
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 P. McLennan II's NPI number?
Dr. Gregory P. McLennan II's NPI number is 1912160052. It was assigned on July 9, 2008, and it is active in the NPI Registry.
What kind of doctor is Dr. Gregory P. McLennan II?
Dr. Gregory P. McLennan II is a urologist in Washington, Missouri. The primary specialty in the NPI Registry is Urology Physician (taxonomy code 208800000X).
Where does Dr. Gregory P. McLennan II practice?
Dr. McLennan practices at 901 Patients First Dr, Washington, MO 63090. Dr. McLennan's primary practice is Mercy Hospital St Louis - Oncology and Hematology Patients First - HOPD in Washington, Missouri. Dmand AI also links Dr. McLennan to 4 hospitals, 4 group practices and clinics, 3 medical groups and 1 hospital outpatient department.
What is Dr. Gregory P. McLennan II's medical license number?
Dr. McLennan holds Missouri license 2014009247.
Which hospitals is Dr. Gregory P. McLennan II affiliated with?
Dr. McLennan is affiliated with Mercy Hospital Washington. Dmand AI links Dr. McLennan to 4 more hospitals.
What medical group is Dr. Gregory P. McLennan II part of?
Dr. McLennan is linked to Mercy Hospital St. Louis. Dmand AI links Dr. McLennan to 3 more medical groups.
Does Dr. Gregory P. McLennan II accept Medicare?
Yes. CMS data shows Dr. McLennan billed Medicare for 2,157 services in 2024, and Dr. McLennan accepts Medicare assignment.
Does Dr. Gregory P. McLennan II offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. McLennan as offering telehealth services.
How many Medicare patients does Dr. Gregory P. McLennan II see?
CMS counts 761 Medicare patients who saw Dr. McLennan in 2024, with an average age of 74.
What services does Dr. Gregory P. McLennan II bill to Medicare?
In 2024, Dr. McLennan's most billed Medicare services were office visit, established patient (99213), office visit, established patient (99214) and surgery: urinary system (51798).
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Where did Dr. Gregory P. McLennan II go to medical school?
Dr. McLennan graduated from Saint Louis University School of Medicine in 2008.
What drugs does Dr. Gregory P. McLennan II prescribe most?
In 2024 Medicare Part D data, Dr. McLennan's most prescribed drugs by claims were Tamsulosin HCl, Myrbetriq and Ciprofloxacin HCl.
Has Dr. Gregory P. McLennan II received payments from drug or device companies?
CMS Open Payments shows $97,801 in general payments to Dr. McLennan from 79 companies from 2016 to 2025. The largest total came from Calyxo, Inc.
How long has Dr. Gregory P. McLennan II been practicing?
Dr. McLennan graduated from medical school in 2008, 18 years ago.
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