Dr. Mara Harmelin Horwitz, MD
- Medicare services, 2022
- 81
- Medicare patients, 2024
- 13
- Part D claims, 2024
- 235
- Hospital affiliations
- 1
- Industry payments
- $1,370
- Practice address
- 315 S Mlk Jr Way, Tacoma, WA 98405
- Practice phone
- Call (253) 403-1000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Horwitz's professional email, personal email and mobile number
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Dr. Mara Harmelin Horwitz is a rheumatologist in Tacoma, Washington
Dr. Horwitz practices at MultiCare Tacoma General Hospital in Tacoma, Washington, part of MultiCare Health System.
Dr. Horwitz's NPI, 1649613332, was assigned on April 11, 2013. Dr. Horwitz graduated from Southern Illinois University School of Medicine in 2013. Dr. Horwitz holds Missouri license 2016009340.
- NPI
- 1649613332NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2961793328
- NPI enumeration date
- April 11, 2013
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (253) 403-1000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 39
- Medical school graduation
- 2013
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Mara Harmelin Horwitz practices at MultiCare Tacoma General Hospital in Tacoma, Washington
Dr. Horwitz's primary practice is MultiCare Tacoma General Hospital, at 315 S Mlk Jr Way, Tacoma, WA 98405 in Pierce County. The practice phone is (253) 403-1000.
- MultiCare Tacoma General Hospital315 S Mlk Jr Way, Tacoma, WA 98405 · Pierce CountyPhone(253) 403-1000
Source: Dmand AI Affiliation Data
Dr. Mara Harmelin Horwitz is affiliated with 3 sites of care and 1 medical group
Dr. Horwitz's primary practice is MultiCare Tacoma General Hospital in Tacoma, Washington, part of MultiCare Health System. The medical group on file is MultiCare Indigo Urgent Care, Spokane, Newport Hwy. Dmand AI also links Dr. Horwitz to 1 more behavioral health center and 1 urgent care center, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Mara Harmelin Horwitz's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Horwitz practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| MultiCare Tacoma General Hospital | 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. Mara Harmelin Horwitz is one of 156 rheumatologists in Washington
Rheumatology is Dr. Horwitz's primary specialty in the NPI Registry, under taxonomy code 207RR0500X. Dr. Horwitz is licensed in Missouri.
Specialties and state licenses
- Rheumatology, MissouriPrimary
Rheumatologists near Dr. Horwitz
Counts of rheumatologists 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. Mara Harmelin Horwitz billed Medicare for 81 services in 2022
CMS data shows 81 Medicare services from Dr. Horwitz across 1 procedure code in 2022, all of them office visits, for 13 Medicare patients. Medicare paid $7,158 for them. Every service was in an office.
Dr. Horwitz's Medicare services by type, 2021 to 2022
- 2021
- 2022
- Office and hospital visits
- 2021: 1912022: 8158%
- Other services
- 2021: 112022: 0100%
Dr. Horwitz compared with the Washington median for rheumatologists, 2022
- Dr. Horwitz
- Washington median
- Medicare services
- 81vs 76389% below
- Medicare patients
- 13vs 20494% below
- Part D claims
- 137vs 92885% below
Medians across 159 rheumatologists in Washington with Dmand AI profiles that report each measure.
Dr. Horwitz'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.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Mara Harmelin Horwitz treated 13 Medicare patients in 2024, average age 72
CMS counts 13 Medicare patients who saw Dr. Horwitz in 2024. 75% of them have arthritis. Their average risk score is 0.98, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Horwitz's median patient age at 18, with 72% women.
Chronic conditions among Dr. Horwitz's Medicare patients, 2024
- Arthritis75%
Share of Medicare patients with each condition. A patient can have several.
Dr. Horwitz's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 18
Patient panel by sex, all payers
- Women72%
- Men28%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Mara Harmelin Horwitz wrote 235 Medicare Part D claims in 2024
In 2024, Dr. Horwitz wrote 235 Medicare Part D claims for 34 patients. 79% of them were for generic drugs. CMS names the drug for 137 of them, across 4 drugs with 11 or more claims each, at $43,335 in total drug cost. In 2023, CMS named 115 claims across 4 drugs.
Dr. Horwitz's Part D claims by kind of drug, 2024
- Generic185 claims79%
- Brand-name and other50 claims21%
Dr. Horwitz'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.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1152024: 13719%
Drugs named by CMS: 4 in 2024, 4 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. Mara Harmelin Horwitz takes part in Medicare
Dr. Horwitz 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. Mara Harmelin Horwitz received $1,370 in industry payments from 2017 to 2025
CMS Open Payments shows 32 general payments to Dr. Horwitz from 7 drug and device companies from 2017 to 2025. Food and beverage make up the largest share, 93% of the total. Abbvie Inc. paid the most, $471.
General payments to Dr. Horwitz by program year, 2017 to 2025
General payments to Dr. Horwitz by kind, 2017 to 2025
- Food and beverage$1,27193%
- Education$997%
Companies that paid Dr. Horwitz the most, 2017 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Mara Harmelin Horwitz graduated from Southern Illinois University School of Medicine
Dr. Horwitz graduated from Southern Illinois University School of Medicine in 2013.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Mara Harmelin Horwitz'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) |
| 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. Mara Harmelin Horwitz
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. Mara Harmelin Horwitz's NPI number?
Dr. Mara Harmelin Horwitz's NPI number is 1649613332. It was assigned on April 11, 2013, and it is active in the NPI Registry.
What kind of doctor is Dr. Mara Harmelin Horwitz?
Dr. Mara Harmelin Horwitz is a rheumatologist in Tacoma, Washington. The primary specialty in the NPI Registry is Rheumatology Physician (taxonomy code 207RR0500X).
Where does Dr. Mara Harmelin Horwitz practice?
Dr. Horwitz practices at 315 S Mlk Jr Way, Tacoma, WA 98405. Dr. Horwitz's primary practice is MultiCare Tacoma General Hospital in Tacoma, Washington, part of MultiCare Health System. Dmand AI also links Dr. Horwitz to 1 behavioral health center and 1 urgent care center.
What is Dr. Mara Harmelin Horwitz's office phone number?
The practice phone on file for Dr. Horwitz is (253) 403-1000.
What is Dr. Mara Harmelin Horwitz's medical license number?
Dr. Horwitz holds Missouri license 2016009340.
Which hospitals is Dr. Mara Harmelin Horwitz affiliated with?
Dr. Horwitz practices at MultiCare Tacoma General Hospital in Tacoma, Washington.
What medical group is Dr. Mara Harmelin Horwitz part of?
Dr. Horwitz is linked to MultiCare Indigo Urgent Care, Spokane, Newport Hwy.
Does Dr. Mara Harmelin Horwitz accept Medicare?
Yes. CMS data shows Dr. Horwitz billed Medicare for 81 services in 2022, and Dr. Horwitz accepts Medicare assignment.
How many Medicare patients does Dr. Mara Harmelin Horwitz see?
CMS counts 13 Medicare patients who saw Dr. Horwitz in 2024, with an average age of 72.
What services does Dr. Mara Harmelin Horwitz bill to Medicare?
In 2022, Dr. Horwitz's most billed Medicare services were office visit, established patient (99214).
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Where did Dr. Mara Harmelin Horwitz go to medical school?
Dr. Horwitz graduated from Southern Illinois University School of Medicine in 2013.
What drugs does Dr. Mara Harmelin Horwitz prescribe most?
In 2024 Medicare Part D data, Dr. Horwitz's most prescribed drugs by claims were Prednisone, Methotrexate and Leucovorin Calcium.
Has Dr. Mara Harmelin Horwitz received payments from drug or device companies?
CMS Open Payments shows $1,370 in general payments to Dr. Horwitz from 7 companies from 2017 to 2025. The largest total came from Abbvie Inc.
How long has Dr. Mara Harmelin Horwitz been practicing?
Dr. Horwitz graduated from medical school in 2013, 13 years ago.
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