Dr. Julio C. Guillen Jr., MD
- Medicare services, 2024
- 1,365
- Medicare patients, 2024
- 268
- Part D claims, 2024
- 2,245
- Hospital affiliations
- 1
- Industry payments
- $1,446
- Practice address
- 21333 Haggerty Rd, Novi, MI 48375
- Practice phone
- Call (504) 347-0777
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Wynhoven Healthcare Center
Novi, Michigan
Find Dr. Guillen'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. Julio C. Guillen Jr. is an internist in Novi, Michigan
Dr. Guillen practices at Wynhoven Healthcare Center in Novi, Michigan.
Dr. Guillen's NPI, 1851393060, was assigned on June 1, 2005. Dr. Guillen graduated from Louisiana State University School of Medicine in Shreveport in 1998. Dr. Guillen holds Louisiana license 024214.
- NPI
- 1851393060NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6002703337
- NPI enumeration date
- June 1, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (504) 347-0777
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 54
- Medical school graduation
- 1998
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Julio C. Guillen Jr. practices at Wynhoven Healthcare Center in Novi, Michigan
Dr. Guillen's primary practice is Wynhoven Healthcare Center, at 21333 Haggerty Rd, Novi, MI 48375 in Oakland County. The practice phone is (504) 347-0777.
- Wynhoven Healthcare Center21333 Haggerty Rd, Novi, MI 48375 · Oakland CountyPhone(504) 347-0777
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Julio C. Guillen Jr. is affiliated with 8 sites of care and 3 medical groups
Dr. Guillen's primary practice is Wynhoven Healthcare Center in Novi, Michigan. Dr. Guillen is also affiliated with East Jefferson General Hospital. The medical group on file is East Jefferson Physicians Group. Dmand AI also links Dr. Guillen to 2 more group practices and clinics, 2 skilled nursing facilities, 2 medical groups, 1 physician office and 1 hospice, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Julio C. Guillen Jr.'s practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Guillen practices, 7 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Wynhoven Healthcare Center | Available with a free account |
| +7 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Julio C. Guillen Jr. is one of 4,804 internists in Michigan
Internal medicine is Dr. Guillen's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Guillen is licensed in Louisiana.
Specialties and state licenses
- Internal medicine, LouisianaPrimary
Internists near Dr. Guillen
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. Julio C. Guillen Jr. billed Medicare for 1,365 services in 2024
CMS data shows 1,365 Medicare services from Dr. Guillen across 10 procedure codes in 2024, for 268 Medicare patients. Medicare paid $102,038 for them.
Dr. Guillen's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1,2632024: 1,3658%
Where Dr. Guillen's Medicare services took place, 2024
- In an office705%
- In a facility1,29595%
Dr. Guillen compared with the Michigan median for internists, 2024
- Dr. Guillen
- Michigan median
- Medicare services
- 1,365vs 4233.2 times
- Medicare patients
- 268vs 15969% above
- Part D claims
- 1,792vs 3145.7 times
Medians across 4,524 internists in Michigan with Dmand AI profiles that report each measure.
Dr. Guillen'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.
Need commercial claims for Dr. Guillen?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Guillen and other internists in Michigan.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Julio C. Guillen Jr. treated 268 Medicare patients in 2024, average age 78
CMS counts 268 Medicare patients who saw Dr. Guillen in 2024. The largest group is 75 to 84, with 102 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 35% are also on Medicaid. Their average risk score is 2.63, 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. Guillen's median patient age at 78, with 55% women.
Dr. Guillen's Medicare patients by age, 2024
Dr. Guillen's Medicare patients by sex, 2024
- Women15457%
- Men11443%
Chronic conditions among Dr. Guillen's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis63%
- Chronic kidney disease54%
- Diabetes51%
- Mood disorders49%
- Heart failure47%
- Depression45%
Share of Medicare patients with each condition. A patient can have several.
Dr. Guillen's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 78
Patient panel by sex, all payers
- Women55%
- Men45%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Julio C. Guillen Jr. wrote 2,245 Medicare Part D claims in 2024
In 2024, Dr. Guillen wrote 2,245 Medicare Part D claims for 247 patients. 86% of them were for generic drugs. CMS names the drug for 1,792 of them, across 63 drugs with 11 or more claims each, at $112,112 in total drug cost. In 2023, CMS named 545 claims across 27 drugs.
Dr. Guillen's Part D claims by kind of drug, 2024
- Generic1,923 claims86%
- Brand-name and other322 claims14%
Dr. Guillen'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. Guillen's Part D claims, 2024
- Opioids2%42 of 2,245 claims
- Antibiotics5%106 of 2,245 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: 5452024: 1,792229%
Drugs named by CMS: 63 in 2024, 27 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
How Dr. Julio C. Guillen Jr. takes part in Medicare
Dr. Guillen accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
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. Julio C. Guillen Jr. received $1,446 in industry payments from 2016 to 2025
CMS Open Payments shows 72 general payments to Dr. Guillen from 23 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Pfizer Inc. paid the most, $286.
General payments to Dr. Guillen by program year, 2016 to 2025
Companies that paid Dr. Guillen 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. Julio C. Guillen Jr. graduated from Louisiana State University School of Medicine in Shreveport
Dr. Guillen graduated from Louisiana State University School of Medicine in Shreveport in 1998.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Julio C. Guillen Jr.'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 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. Julio C. Guillen Jr.
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. Julio C. Guillen Jr.'s NPI number?
Dr. Julio C. Guillen Jr.'s NPI number is 1851393060. It was assigned on June 1, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Julio C. Guillen Jr.?
Dr. Julio C. Guillen Jr. is an internist in Novi, Michigan. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Julio C. Guillen Jr. practice?
Dr. Guillen practices at 21333 Haggerty Rd, Novi, MI 48375. Dr. Guillen's primary practice is Wynhoven Healthcare Center in Novi, Michigan. Dmand AI also links Dr. Guillen to 2 group practices and clinics, 2 skilled nursing facilities, 2 medical groups, 1 physician office and 1 hospice.
What is Dr. Julio C. Guillen Jr.'s office phone number?
The practice phone on file for Dr. Guillen is (504) 347-0777.
What is Dr. Julio C. Guillen Jr.'s medical license number?
Dr. Guillen holds Louisiana license 024214.
Which hospitals is Dr. Julio C. Guillen Jr. affiliated with?
Dr. Guillen is affiliated with East Jefferson General Hospital.
What medical group is Dr. Julio C. Guillen Jr. part of?
Dr. Guillen is linked to East Jefferson Physicians Group. Dmand AI links Dr. Guillen to 2 more medical groups.
Does Dr. Julio C. Guillen Jr. accept Medicare?
Yes. CMS data shows Dr. Guillen billed Medicare for 1,365 services in 2024, and Dr. Guillen accepts Medicare assignment.
How many Medicare patients does Dr. Julio C. Guillen Jr. see?
CMS counts 268 Medicare patients who saw Dr. Guillen in 2024, with an average age of 78.
What services does Dr. Julio C. Guillen Jr. bill to Medicare?
In 2024, Dr. Guillen's most billed Medicare services were nursing facility care (99308), nursing facility care (99309) and hospital inpatient care (99232).
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Where did Dr. Julio C. Guillen Jr. go to medical school?
Dr. Guillen graduated from Louisiana State University School of Medicine in Shreveport in 1998.
What drugs does Dr. Julio C. Guillen Jr. prescribe most?
In 2024 Medicare Part D data, Dr. Guillen's most prescribed drugs by claims were Atorvastatin Calcium, Pantoprazole Sodium and Amlodipine Besylate.
Has Dr. Julio C. Guillen Jr. received payments from drug or device companies?
CMS Open Payments shows $1,446 in general payments to Dr. Guillen from 23 companies from 2016 to 2025. The largest total came from Pfizer Inc.
How long has Dr. Julio C. Guillen Jr. been practicing?
Dr. Guillen graduated from medical school in 1998, 28 years ago.
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