HIV InfectionsHomosexuality, MaleSexual Behavior
Dara B. Grennan
NPI1518282938PAC ID6507092962
- Medicare services, 2024
- 34
- Medicare patients, 2024
- 38
- Part D claims, 2024
- 652
- Publications
- 9
- MIPS score, 2024
- 95
- Practice address
- 1901 W Harrison St, Chicago, IL 60612
- Practice phone
- Call (312) 864-6000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Dara Grennan's professional email, personal email and mobile number
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Dara B. Grennan is an infectious disease specialist in Chicago, Illinois
Dara Grennan practices at John H. Stroger, Jr. Hospital of Cook County in Chicago, Illinois, part of Cook County Government.
Dara Grennan's NPI, 1518282938, was assigned on March 29, 2010. Dara Grennan holds Illinois license 036-137502.
NPI and contact details
- NPI
- 1518282938NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6507092962
- NPI enumeration date
- March 29, 2010
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (312) 864-6000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 45
- Medical school graduation
- 2007
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dara B. Grennan practices at John H. Stroger, Jr. Hospital of Cook County in Chicago, Illinois
Dara Grennan's primary practice is John H. Stroger, Jr. Hospital of Cook County, at 1901 W Harrison St, Chicago, IL 60612 in Cook County. The practice phone is (312) 864-6000.
- John H. Stroger, Jr. Hospital of Cook County1901 W Harrison St, Chicago, IL 60612 · Cook CountyPhone(312) 864-6000
Source: Dmand AI Affiliation Data
Dara B. Grennan is affiliated with 1 site of care and 3 medical groups
Dara Grennan's primary practice is John H. Stroger, Jr. Hospital of Cook County in Chicago, Illinois, part of Cook County Government. The medical group on file is Northwestern Medical Faculty Foundation. Dmand AI also links Dara Grennan to 2 more medical groups, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dara B. Grennan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dara Grennan practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| John H. Stroger, Jr. Hospital of Cook County | Available with a free account |
| +2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dara B. Grennan is one of 400 infectious disease specialists in Illinois
Infectious disease is Dara Grennan's primary specialty in the NPI Registry, under taxonomy code 207RI0200X. Dmand AI has Dara Grennan's licenses on file in 2 states: Illinois and Utah.
Specialties and state licenses
- Infectious disease, IllinoisPrimary
- Hospitalist, Utah
Infectious disease specialists near Dara Grennan
Counts of infectious disease specialists with a Dmand AI profile, by place and practice. Each opens the list.
400infectious disease specialists in Illinois148infectious disease specialists in Chicago15infectious disease specialists at John H. Stroger, Jr. Hospital of Cook County
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dara B. Grennan billed Medicare for 34 services in 2024
CMS data shows 34 Medicare services from Dara Grennan across 2 procedure codes in 2024, for 38 Medicare patients. Medicare paid $3,873 for them.
Medicare services, 202434
Medicare patients38
Paid by Medicare$3,873
Procedure codes2
Dara Grennan's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 252024: 3436%
Where Dara Grennan's Medicare services took place, 2024
- In an office1853%
- In a facility1647%
Dara Grennan compared with the Illinois median for infectious disease specialists, 2024
- Dara Grennan
- Illinois median
- Medicare services
- 34vs 44092% below
- Medicare patients
- 38vs 21082% below
- Part D claims
- 473vs 1952.4 times
Medians across 383 infectious disease specialists in Illinois with Dmand AI profiles that report each measure.
Dara Grennan'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 Dara Grennan and other infectious disease specialists in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dara B. Grennan treated 38 Medicare patients in 2024, average age 71
CMS counts 38 Medicare patients who saw Dara Grennan in 2024. The largest group is 65 to 74, with 24 patients. 75% of them have high blood pressure, and 61% have high cholesterol. 42% are also on Medicaid. Their average risk score is 1.88, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dara Grennan's median patient age at 64, with 47% women.
Medicare patients, 202438
Average age71
Average risk score1.88
Also on Medicaid42%
Dara Grennan's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dara Grennan's Medicare patients by sex, 2024
- Women1334%
- Men2566%
Chronic conditions among Dara Grennan's Medicare patients, 2024
- High blood pressure75%
- High cholesterol61%
- Arthritis53%
- Chronic kidney disease42%
- Mood disorders34%
- Depression32%
- Diabetes32%
- Heart failure32%
Share of Medicare patients with each condition. A patient can have several.
Dara Grennan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 64
Patient panel by sex, all payers
- Women47%
- Men53%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dara B. Grennan wrote 652 Medicare Part D claims in 2024
In 2024, Dara Grennan wrote 652 Medicare Part D claims for 29 patients. 60% of them were for generic drugs. CMS names the drug for 473 of them, across 22 drugs with 11 or more claims each, at $619,068 in total drug cost. In 2023, CMS named 483 claims across 20 drugs.
Part D claims, 2024652
Drugs named by CMS22
Total drug cost$619,068
Part D patients29
Dara Grennan's Part D claims by kind of drug, 2024
- Generic390 claims60%
- Brand-name and other262 claims40%
Dara Grennan'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 Dara Grennan's Part D claims, 2024
- Opioids4%23 of 652 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: 4832024: 4732%
Drugs named by CMS: 22 in 2024, 20 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
Dara B. Grennan scored 95 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 95 out of 100 for Dara Grennan for performance year 2024, reported through an alternative payment model (APM). Dara Grennan accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dara Grennan's MIPS scores, performance year 2024
- 95of 100Final score
- 83of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dara B. Grennan has 9 publications on record
Dmand AI links 9 papers to Dara Grennan in 2023. The most frequent topics are Anti-Bacterial Agents, HIV Infections and House Calls. Dara Grennan has published most often in JAMA. Dara Grennan's most frequent co-authors are Joerg Albrecht, MD, Sameer Ahmed Alvi, MD and Cara M. Borelli.
Papers9
Topics Dara Grennan writes about most
- Anti-Bacterial Agents
- HIV Infections
- House Calls
- Intimate Partner Violence
Dara Grennan's most frequent co-authors
Recent publications by Dara Grennan
FamilyHouse CallsIntimate Partner Violence
Anti-Bacterial AgentsAnti-Infective AgentsDrug Resistance, Microbial
Alzheimer DiseaseDementiaDementia, Vascular
CoinfectionHepacivirusHepatitis C
See who Dara Grennan researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dara Grennan works with, so you can find a warm path to the right infectious disease specialists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Sources for Dara B. Grennan'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 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)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| 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 Dara B. Grennan
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dara B. Grennan's NPI number?
Dara B. Grennan's NPI number is 1518282938. It was assigned on March 29, 2010, and it is active in the NPI Registry.
What does Dara B. Grennan specialize in?
Dara B. Grennan is an infectious disease specialist in Chicago, Illinois. The primary specialty in the NPI Registry is Infectious Disease Physician (taxonomy code 207RI0200X).
Where does Dara B. Grennan practice?
Dara Grennan practices at 1901 W Harrison St, Chicago, IL 60612. Dara Grennan's primary practice is John H. Stroger, Jr. Hospital of Cook County in Chicago, Illinois, part of Cook County Government. Dmand AI also links Dara Grennan to 2 medical groups.
What is Dara B. Grennan's office phone number?
The practice phone on file for Dara Grennan is (312) 864-6000.
What is Dara B. Grennan's medical license number?
Dara Grennan holds Illinois license 036-137502, one of the licenses on file in 2 states.
Which states has Dara B. Grennan been licensed in?
Dmand AI has state licenses on file for Dara Grennan in Illinois and Utah.
Which hospitals is Dara B. Grennan affiliated with?
Dara Grennan practices at John H. Stroger, Jr. Hospital of Cook County in Chicago, Illinois.
What medical group is Dara B. Grennan part of?
Dara Grennan is linked to Northwestern Medical Faculty Foundation. Dmand AI links Dara Grennan to 2 more medical groups.
Does Dara B. Grennan accept Medicare?
Yes. CMS data shows Dara Grennan billed Medicare for 34 services in 2024, and Dara Grennan accepts Medicare assignment.
What is Dara B. Grennan's MIPS score?
Dara Grennan's MIPS final score for performance year 2024 is 95 out of 100, reported through an alternative payment model (APM).
Show 6 more questionsShow fewer questions
How many Medicare patients does Dara B. Grennan see?
CMS counts 38 Medicare patients who saw Dara Grennan in 2024, with an average age of 71.
What services does Dara B. Grennan bill to Medicare?
In 2024, Dara Grennan's most billed Medicare services were office visit, established patient (99215) and hospital inpatient care (99222).
What drugs does Dara B. Grennan prescribe most?
In 2024 Medicare Part D data, Dara Grennan's most prescribed drugs by claims were Dovato, Biktarvy and Atorvastatin Calcium.
How long has Dara B. Grennan been practicing?
Dara Grennan graduated from medical school in 2007, 19 years ago.
Does Dara B. Grennan do research?
Dmand AI links 9 publications to Dara Grennan.
Who does Dara B. Grennan publish with?
Dara Grennan's most frequent co-authors are Joerg Albrecht, MD (1 shared paper), Sameer Ahmed Alvi, MD (1 shared paper) and Cara M. Borelli (1 shared paper).
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