Dr. Heather Ruth Cassell, MD
- Medicare services, 2022
- 15
- Medicare patients, 2024
- 12
- Part D claims, 2024
- 178
- Publications
- 1
- Clinical trials
- 1
- Practice address
- 1501 N Campbell Ave, Tucson, AZ 85724
- Practice phone
- Call (520) 626-2761
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
University of Arizona
Tucson, Arizona
Find Dr. Cassell'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. Heather Ruth Cassell is an allergist and immunologist in Tucson, Arizona
Dr. Cassell practices at University of Arizona in Tucson, Arizona.
Dr. Cassell's NPI, 1093700684, was assigned on September 20, 2005. Dr. Cassell graduated from University of Arizona College of Medicine in 1999. Dr. Cassell holds Arizona license 30265.
- NPI
- 1093700684NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6507936820
- NPI enumeration date
- September 20, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (520) 626-2761
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 53
- Medical school graduation
- 1999
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Heather Ruth Cassell practices at University of Arizona in Tucson, Arizona
Dr. Cassell's primary practice is University of Arizona, at 1501 N Campbell Ave, Tucson, AZ 85724 in Pima County. The practice phone is (520) 626-2761.
- University of Arizona1501 N Campbell Ave, Tucson, AZ 85724 · Pima CountyPhone(520) 626-2761
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Heather Ruth Cassell is affiliated with 2 sites of care and 2 medical groups
Dr. Cassell's primary practice is University of Arizona in Tucson, Arizona. The medical group on file is Banner Medical Group. Dmand AI also links Dr. Cassell to 1 more group practice or clinic and 1 medical group, 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. Heather Ruth Cassell's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Cassell practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| University of Arizona | Available with a free account |
| +1 more site and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Heather Ruth Cassell is one of 74 allergists and immunologists in Arizona
Allergy and immunology is Dr. Cassell's primary specialty in the NPI Registry, under taxonomy code 207K00000X. Dr. Cassell is licensed in Arizona.
Specialties and state licenses
- Allergy and immunology, ArizonaPrimary
Allergists and immunologists near Dr. Cassell
Counts of allergists and immunologists 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. Heather Ruth Cassell billed Medicare for 15 services in 2022
CMS data shows 15 Medicare services from Dr. Cassell across 1 procedure code in 2022, all of them office visits, for 12 Medicare patients. Medicare paid $1,137 for them. Every service was in an office.
Dr. Cassell's Medicare services by type, 2021 to 2022
- 2021
- 2022
- Office and hospital visits
- 2021: 122022: 1525%
Dr. Cassell compared with the Arizona median for allergists and immunologists, 2022
- Dr. Cassell
- Arizona median
- Medicare services
- 15vs 2,96599% below
- Medicare patients
- 12vs 21194% below
- Part D claims
- 82vs 38879% below
Medians across 71 allergists and immunologists in Arizona with Dmand AI profiles that report each measure.
Dr. Cassell's most billed Medicare procedure codes, 2022
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. Cassell?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Cassell and other allergists and immunologists in Arizona.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Heather Ruth Cassell treated 12 Medicare patients in 2024, average age 73
CMS counts 12 Medicare patients who saw Dr. Cassell in 2024. Their average risk score is 1.00, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Cassell's median patient age at 10, with 49% women.
Dr. Cassell's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 10
Patient panel by sex, all payers
- Women49%
- Men50%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Heather Ruth Cassell wrote 178 Medicare Part D claims in 2024
In 2024, Dr. Cassell wrote 178 Medicare Part D claims for 22 patients. 71% of them were for generic drugs. CMS names the drug for 82 of them, across 5 drugs with 11 or more claims each, at $10,003 in total drug cost. In 2023, CMS named 80 claims across 5 drugs.
Dr. Cassell's Part D claims by kind of drug, 2024
- Generic127 claims71%
- Brand-name51 claims29%
Dr. Cassell'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. Cassell's Part D claims, 2024
- Antibiotics10%18 of 178 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: 802024: 823%
Drugs named by CMS: 5 in 2024, 5 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. Heather Ruth Cassell scored 93 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 93 out of 100 for Dr. Cassell for performance year 2024, reported through an alternative payment model (APM). Dr. Cassell accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Cassell's MIPS scores, performance year 2024
- 93of 100Final score
- 74.6of 100Quality
- 99of 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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Dr. Heather Ruth Cassell has 1 publication on record
Dmand AI links 1 paper to Dr. Cassell in 2020. Dr. Cassell's most frequent co-author is Tara Friedel Carr, MD.
Dr. Cassell's most frequent co-authors
Recent publications by Dr. Cassell
See who Dr. Cassell researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Cassell works with, so you can find a warm path to the right allergists and immunologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Heather Ruth Cassell has worked on 1 clinical trial
Dmand AI links Dr. Cassell to 1 clinical trial. Conditions studied include Peanut Hypersensitivity and Nut and Peanut Hypersensitivity.
Conditions in Dr. Cassell's trials
- Peanut Hypersensitivity
- Nut and Peanut Hypersensitivity
Investigators on the most trials with Dr. Cassell
- Sara Anvari, MD1 shared trial
- Philippe Begin, MD1 shared trial
- Terri F. Brown-Whitehorn, MD1 shared trial
Recent clinical trials with Dr. Cassell
Safety and Efficacy Study of Viaskin Peanut in Peanut-allergic Young Children 1-3 Years of Age (opens in a new tab)
Sources: Dmand AI Research Linkage; and ClinicalTrials.gov (National Library of Medicine)
Dr. Heather Ruth Cassell received $1,076 in industry payments from 2016 to 2025
CMS Open Payments shows 33 general payments to Dr. Cassell from 15 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 99% of the total. AstraZeneca Pharmaceuticals LP paid the most, $282.
General payments to Dr. Cassell by program year, 2016 to 2025
General payments to Dr. Cassell by kind, 2016 to 2025
- Food and beverage$1,06899%
- Education$81%
Companies that paid Dr. Cassell 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. Heather Ruth Cassell graduated from University of Arizona College of Medicine
Dr. Cassell graduated from University of Arizona College of Medicine in 1999.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Heather Ruth Cassell'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)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 |
| Clinical trials and co-investigators | Dmand AI Research LinkageClinicalTrials.gov (National Library of Medicine) (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. Heather Ruth Cassell
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. Heather Ruth Cassell's NPI number?
Dr. Heather Ruth Cassell's NPI number is 1093700684. It was assigned on September 20, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Heather Ruth Cassell?
Dr. Heather Ruth Cassell is an allergist and immunologist in Tucson, Arizona. The primary specialty in the NPI Registry is Allergy & Immunology Physician (taxonomy code 207K00000X).
Where does Dr. Heather Ruth Cassell practice?
Dr. Cassell practices at 1501 N Campbell Ave, Tucson, AZ 85724. Dr. Cassell's primary practice is University of Arizona in Tucson, Arizona. Dmand AI also links Dr. Cassell to 1 group practice or clinic and 1 medical group.
What is Dr. Heather Ruth Cassell's office phone number?
The practice phone on file for Dr. Cassell is (520) 626-2761.
What is Dr. Heather Ruth Cassell's medical license number?
Dr. Cassell holds Arizona license 30265.
What medical group is Dr. Heather Ruth Cassell part of?
Dr. Cassell is linked to Banner Medical Group. Dmand AI links Dr. Cassell to 1 more medical group.
Does Dr. Heather Ruth Cassell accept Medicare?
Yes. CMS data shows Dr. Cassell billed Medicare for 15 services in 2022, and Dr. Cassell accepts Medicare assignment.
What is Dr. Heather Ruth Cassell's MIPS score?
Dr. Cassell's MIPS final score for performance year 2024 is 93 out of 100, reported through an alternative payment model (APM).
How many Medicare patients does Dr. Heather Ruth Cassell see?
CMS counts 12 Medicare patients who saw Dr. Cassell in 2024, with an average age of 73.
What services does Dr. Heather Ruth Cassell bill to Medicare?
In 2022, Dr. Cassell's most billed Medicare services were office visit, established patient (99214).
Show 6 more questionsShow fewer questions
Where did Dr. Heather Ruth Cassell go to medical school?
Dr. Cassell graduated from University of Arizona College of Medicine in 1999.
What drugs does Dr. Heather Ruth Cassell prescribe most?
In 2024 Medicare Part D data, Dr. Cassell's most prescribed drugs by claims were Montelukast Sodium, Symbicort and Azithromycin.
Has Dr. Heather Ruth Cassell received payments from drug or device companies?
CMS Open Payments shows $1,076 in general payments to Dr. Cassell from 15 companies from 2016 to 2025. The largest total came from AstraZeneca Pharmaceuticals LP.
How long has Dr. Heather Ruth Cassell been practicing?
Dr. Cassell graduated from medical school in 1999, 27 years ago.
Does Dr. Heather Ruth Cassell do research?
Dmand AI links 1 publication to Dr. Cassell. Dr. Cassell has worked on 1 clinical trial.
Who does Dr. Heather Ruth Cassell publish with?
Dr. Cassell's most frequent co-authors are Tara Friedel Carr, MD (1 shared paper).
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