Dr. Grisel Mac Williams, MD
- Medicare services, 2024
- 397
- Medicare patients, 2024
- 38
- Part D claims, 2024
- 6,756
- Industry payments
- $9,252
- Affiliated sites
- 2
- Practice address
- 810 E 39th Pl, Hialeah, FL 33013
- Practice phone
- Call (305) 691-7018
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Grisel Mac Williams MD PA
Hialeah, Florida
Find Dr. Mac Williams' 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. Grisel Mac Williams is an internist in Hialeah, Florida
Dr. Mac Williams practices at Grisel Mac Williams MD PA in Hialeah, Florida.
Dr. Mac Williams' NPI, 1053396549, was assigned on December 7, 2005. Dr. Mac Williams graduated from Universidad Central del Este Facultad de Medicina in 1980. Dr. Mac Williams holds Florida license ME0045706.
- NPI
- 1053396549NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7315125465
- NPI enumeration date
- December 7, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (305) 691-7018
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 72
- Medical school graduation
- 1980
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Grisel Mac Williams practices at Grisel Mac Williams MD PA in Hialeah, Florida
Dr. Mac Williams' primary practice is Grisel Mac Williams MD PA, at 810 E 39th Pl, Hialeah, FL 33013 in Miami-Dade County. The practice phone is (305) 691-7018.
- Grisel Mac Williams MD PA810 E 39th Pl, Hialeah, FL 33013 · Miami-Dade CountyPhone(305) 691-7018
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Grisel Mac Williams is affiliated with 3 sites of care and 1 medical group
Dr. Mac Williams' primary practice is Grisel Mac Williams MD PA in Hialeah, Florida. The medical group on file is Grisel MacWilliams M.D., PA. Dmand AI also links Dr. Mac Williams to 1 more group practice or clinic and 1 home health agency, 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. Grisel Mac Williams' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Mac Williams practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Grisel Mac Williams MD PA | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Grisel Mac Williams is one of 9,009 internists in Florida
Internal medicine is Dr. Mac Williams' primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dmand AI has Dr. Mac Williams' licenses on file in 2 states: Florida and New Jersey.
Specialties and state licenses
- Internal medicine, FloridaPrimary
- New Jersey license
Clinical focus
Dmand AI lists acid reflux, acute skin infection, anxiety, arthritis, asthma, atrial fibrillation and flutter, bipolar disorder and bronchitis among the conditions Dr. Mac Williams treats.
Internists near Dr. Mac Williams
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. Grisel Mac Williams billed Medicare for 397 services in 2024
CMS data shows 397 Medicare services from Dr. Mac Williams across 4 procedure codes in 2024, for 38 Medicare patients. Medicare paid $33,191 for them. Every service was in an office.
Dr. Mac Williams' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 4572024: 36620%
- Other services
- 2023: 112024: 31182%
Dr. Mac Williams compared with the Florida median for internists, 2024
- Dr. Mac Williams
- Florida median
- Medicare services
- 397vs 55528% below
- Medicare patients
- 38vs 21582% below
- Part D claims
- 6,020vs 46612.9 times
Medians across 8,488 internists in Florida with Dmand AI profiles that report each measure.
Dr. Mac Williams' 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. Mac Williams?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Mac Williams and other internists in Florida.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Grisel Mac Williams treated 38 Medicare patients in 2024, average age 70
CMS counts 38 Medicare patients who saw Dr. Mac Williams in 2024. The largest group is under 65, with 11 patients. 75% of them have diabetes, and 75% have high cholesterol. 68% are also on Medicaid. Their average risk score is 1.62, 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. Mac Williams' median patient age at 60, with 65% women.
Dr. Mac Williams' Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Mac Williams' Medicare patients by sex, 2024
- Women2771%
- Men1129%
Chronic conditions among Dr. Mac Williams' Medicare patients, 2024
- Diabetes75%
- High cholesterol75%
- High blood pressure68%
- Arthritis55%
- Mood disorders55%
- Depression50%
- Chronic kidney disease47%
- Anxiety45%
Share of Medicare patients with each condition. A patient can have several.
Dr. Mac Williams' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 60
Patient panel by sex, all payers
- Women65%
- Men34%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Grisel Mac Williams wrote 6,756 Medicare Part D claims in 2024
In 2024, Dr. Mac Williams wrote 6,756 Medicare Part D claims for 343 patients. 85% of them were for generic drugs. CMS names the drug for 6,020 of them, across 118 drugs with 11 or more claims each, at $619,637 in total drug cost. In 2023, CMS named 6,481 claims across 127 drugs.
Dr. Mac Williams' Part D claims by kind of drug, 2024
- Generic5,773 claims85%
- Brand-name944 claims14%
- Other39 claims1%
Dr. Mac Williams' 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. Mac Williams' Part D claims, 2024
- Opioids0%15 of 6,756 claims
- Antibiotics3%224 of 6,756 claims
- Antipsychotics, patients 65 and over1%60 of 6,756 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: 6,4812024: 6,0207%
Drugs named by CMS: 118 in 2024, 127 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. Grisel Mac Williams takes part in Medicare
Dr. Mac Williams 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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Dr. Grisel Mac Williams received $9,252 in industry payments from 2016 to 2025
CMS Open Payments shows 391 general payments to Dr. Mac Williams from 39 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 98% of the total. Novo Nordisk Inc paid the most, $1,460.
General payments to Dr. Mac Williams by program year, 2016 to 2025
General payments to Dr. Mac Williams by kind, 2016 to 2025
- Food and beverage$9,07398%
- Education$1502%
- Gifts$290%
Companies that paid Dr. Mac Williams 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. Grisel Mac Williams has 1 award and honors on record
Dmand AI lists 1 award for Dr. Mac Williams, most recently CMS Stage 1 2012 in 2011.
Awards and honors for Dr. Mac Williams
- 2011
- CMS Stage 1 2012
Source: Dmand AI Professional Profile Data
Dr. Grisel Mac Williams graduated from Universidad Central del Este Facultad de Medicina
Dr. Mac Williams graduated from Universidad Central del Este Facultad de Medicina in 1980.
- Medical school
Source: Dmand AI Professional Profile Data
Dr. Grisel Mac Williams accepts plans from 13 insurance carriers
Dr. Mac Williams is in network with 13 carriers, including Aetna, United Healthcare and Elevance. HMO plans come from the most carriers, 8. Check the plan with the practice before a visit.
- Aetna
- United Healthcare
- Elevance
- HCSC
- Aspirus Health Plan
- Blue Cross Blue Shield of Michigan
- Molina
- Alliant Health Plans
- +5 more carriersWith a free account
Plan types Dr. Mac Williams accepts, by number of carriers
- HMO8
- PPO7
- Medicare5
- EPO4
- POS3
Source: Dmand AI Insurance Network Data
Sources for Dr. Grisel Mac Williams'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) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network 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. Grisel Mac Williams
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. Grisel Mac Williams' NPI number?
Dr. Grisel Mac Williams' NPI number is 1053396549. It was assigned on December 7, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Grisel Mac Williams?
Dr. Grisel Mac Williams is an internist in Hialeah, Florida. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Grisel Mac Williams practice?
Dr. Mac Williams practices at 810 E 39th Pl, Hialeah, FL 33013. Dr. Mac Williams' primary practice is Grisel Mac Williams MD PA in Hialeah, Florida. Dmand AI also links Dr. Mac Williams to 1 group practice or clinic and 1 home health agency.
What is Dr. Grisel Mac Williams' office phone number?
The practice phone on file for Dr. Mac Williams is (305) 691-7018.
What is Dr. Grisel Mac Williams' medical license number?
Dr. Mac Williams holds Florida license ME0045706, one of the licenses on file in 2 states.
Which states has Dr. Grisel Mac Williams been licensed in?
Dmand AI has state licenses on file for Dr. Mac Williams in Florida (1985 to 2026) and New Jersey (since 1985).
What medical group is Dr. Grisel Mac Williams part of?
Dr. Mac Williams is linked to Grisel MacWilliams M.D., PA.
Does Dr. Grisel Mac Williams accept Medicare?
Yes. CMS data shows Dr. Mac Williams billed Medicare for 397 services in 2024, and Dr. Mac Williams accepts Medicare assignment.
How many Medicare patients does Dr. Grisel Mac Williams see?
CMS counts 38 Medicare patients who saw Dr. Mac Williams in 2024, with an average age of 70.
What services does Dr. Grisel Mac Williams bill to Medicare?
In 2024, Dr. Mac Williams' most billed Medicare services were office visit, established patient (99214), care management and other visits (99490) and office visit, established patient (99215).
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Where did Dr. Grisel Mac Williams go to medical school?
Dr. Mac Williams graduated from Universidad Central del Este Facultad de Medicina in 1980.
What drugs does Dr. Grisel Mac Williams prescribe most?
In 2024 Medicare Part D data, Dr. Mac Williams' most prescribed drugs by claims were Rosuvastatin Calcium, Losartan Potassium and Metoprolol Succinate.
Has Dr. Grisel Mac Williams received payments from drug or device companies?
CMS Open Payments shows $9,252 in general payments to Dr. Mac Williams from 39 companies from 2016 to 2025. The largest total came from Novo Nordisk Inc.
How long has Dr. Grisel Mac Williams been practicing?
Dr. Mac Williams graduated from medical school in 1980, 46 years ago.
What insurance does Dr. Grisel Mac Williams accept?
Dr. Mac Williams is in network with 13 carriers, including Aetna, United Healthcare and Elevance. HMO plans come from the most carriers, 8. Check the plan with the practice before a visit.
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