Guillermo Marquez Macias Sr.
- Medicare patients, 2024
- 38
- Part D claims, 2024
- 124
- Industry payments
- $14
- Affiliated sites
- 2
- Medical groups
- 3
- Practice address
- 900 Business Center Dr, Horsham, PA 19044
- Practice phone
- Call (215) 957-9300
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Quest Diagnostics Clinical Laboratories Inc
Horsham, Pennsylvania
Find Guillermo Macias' 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.
Guillermo Marquez Macias Sr. is a family nurse practitioner in Horsham, Pennsylvania
Guillermo Macias practices at Quest Diagnostics Clinical Laboratories Inc in Horsham, Pennsylvania.
Guillermo Macias' NPI, 1013547231, was assigned on January 16, 2020. Guillermo Macias holds Texas license AP144288.
- NPI
- 1013547231NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8820138217
- NPI enumeration date
- January 16, 2020
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (215) 957-9300
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 33
- Medical school graduation
- 2019
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Guillermo Marquez Macias Sr. practices at Quest Diagnostics Clinical Laboratories Inc in Horsham, Pennsylvania
Guillermo Macias' primary practice is Quest Diagnostics Clinical Laboratories Inc, at 900 Business Center Dr, Horsham, PA 19044 in Montgomery County. The practice phone is (215) 957-9300.
- Quest Diagnostics Clinical Laboratories Inc900 Business Center Dr, Horsham, PA 19044 · Montgomery CountyPhone(215) 957-9300
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Guillermo Marquez Macias Sr. is affiliated with 3 sites of care and 3 medical groups
Guillermo Macias' primary practice is Quest Diagnostics Clinical Laboratories Inc in Horsham, Pennsylvania. The medical group on file is AFC Urgent Care. Dmand AI also links Guillermo Macias to 2 more medical groups, 1 community health center and 1 group practice or clinic, 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 Guillermo Marquez Macias Sr.'s practice
Dmand AI tracks the electronic health record (EHR) system at each site where Guillermo Macias practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Quest Diagnostics Clinical Laboratories Inc | 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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Guillermo Marquez Macias Sr. is one of 5,541 family nurse practitioners in Pennsylvania
Family is Guillermo Macias' primary specialty in the NPI Registry, under taxonomy code 363LF0000X. Guillermo Macias is licensed in Texas.
Specialties and state licenses
- Family nurse practitioner, TexasPrimary
Family nurse practitioners near Guillermo Macias
Counts of family nurse practitioners 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
Guillermo Marquez Macias Sr. treated 38 Medicare patients in 2024, average age 73
CMS counts 38 Medicare patients who saw Guillermo Macias in 2024. The largest group is 65 to 74, with 18 patients. 75% of them have high blood pressure, and 75% have high cholesterol. Their average risk score is 0.97, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Guillermo Macias' median patient age at 72, with 53% women.
Guillermo Macias' Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Guillermo Macias' Medicare patients by sex, 2024
- Women2463%
- Men1437%
Chronic conditions among Guillermo Macias' Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis42%
- Ischemic heart disease42%
- Anxiety32%
Share of Medicare patients with each condition. A patient can have several.
Guillermo Macias' 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
- Women53%
- Men47%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Guillermo Marquez Macias Sr. wrote 124 Medicare Part D claims in 2024
In 2024, Guillermo Macias wrote 124 Medicare Part D claims for 82 patients. 90% of them were for generic drugs.
Guillermo Macias' Part D claims by kind of drug, 2024
- Generic111 claims90%
- Brand-name and other13 claims10%
Drug classes CMS tracks in Guillermo Macias' Part D claims, 2024
- Antibiotics44%54 of 124 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Guillermo Marquez Macias Sr. takes part in Medicare
Guillermo Macias accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Guillermo Marquez Macias Sr. received $14 in industry payments in 2025
CMS Open Payments shows 1 general payment to Guillermo Macias from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. GlaxoSmithKline, LLC. paid the most, $14.
Companies that paid Guillermo Macias the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Guillermo Marquez Macias Sr.'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 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 (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) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| 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 Guillermo Marquez Macias Sr.
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Guillermo Marquez Macias Sr.'s NPI number?
Guillermo Marquez Macias Sr.'s NPI number is 1013547231. It was assigned on January 16, 2020, and it is active in the NPI Registry.
What does Guillermo Marquez Macias Sr. specialize in?
Guillermo Marquez Macias Sr. is a family nurse practitioner in Horsham, Pennsylvania. The primary specialty in the NPI Registry is Family Nurse Practitioner (taxonomy code 363LF0000X).
Where does Guillermo Marquez Macias Sr. practice?
Guillermo Macias practices at 900 Business Center Dr, Horsham, PA 19044. Guillermo Macias' primary practice is Quest Diagnostics Clinical Laboratories Inc in Horsham, Pennsylvania. Dmand AI also links Guillermo Macias to 2 medical groups, 1 community health center and 1 group practice or clinic.
What is Guillermo Marquez Macias Sr.'s office phone number?
The practice phone on file for Guillermo Macias is (215) 957-9300.
What is Guillermo Marquez Macias Sr.'s medical license number?
Guillermo Macias holds Texas license AP144288.
What medical group is Guillermo Marquez Macias Sr. part of?
Guillermo Macias is linked to AFC Urgent Care. Dmand AI links Guillermo Macias to 2 more medical groups.
Does Guillermo Marquez Macias Sr. accept Medicare?
Yes. CMS lists Guillermo Macias as accepting Medicare assignment.
How many Medicare patients does Guillermo Marquez Macias Sr. see?
CMS counts 38 Medicare patients who saw Guillermo Macias in 2024, with an average age of 73.
Has Guillermo Marquez Macias Sr. received payments from drug or device companies?
CMS Open Payments shows $14 in general payments to Guillermo Macias from 1 company from 2025 to 2025. The largest total came from GlaxoSmithKline, LLC.
How long has Guillermo Marquez Macias Sr. been practicing?
Guillermo Macias graduated from medical school in 2019, 7 years ago.
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