Dr. Christina Mariyam Joy, MD
- Medicare services, 2024
- 316
- Medicare patients, 2024
- 137
- Part D claims, 2024
- 629
- MIPS score, 2024
- 88
- Hospital affiliations
- 2
- Practice address
- 9200 W Wisconsin Ave, Milwaukee, WI 53226
- Practice phone
- Call (414) 805-3000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Mariyam Joy's professional email, personal email and mobile number
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Dr. Christina Mariyam Joy is a nephrologist in Milwaukee, Wisconsin
Dr. Mariyam Joy practices at Froedtert Hospital in Milwaukee, Wisconsin, part of Froedtert ThedaCare Health.
Dr. Mariyam Joy's NPI, 1639553605, was assigned on July 19, 2015. Dr. Mariyam Joy holds Wisconsin license 76560.
- NPI
- 1639553605NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6002220753
- NPI enumeration date
- July 19, 2015
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (414) 805-3000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 41
- Medical school graduation
- 2011
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Christina Mariyam Joy practices at Froedtert Hospital in Milwaukee, Wisconsin
Dr. Mariyam Joy's primary practice is Froedtert Hospital, at 9200 W Wisconsin Ave, Milwaukee, WI 53226 in Milwaukee County. The practice phone is (414) 805-3000.
- Froedtert Hospital9200 W Wisconsin Ave, Milwaukee, WI 53226 · Milwaukee CountyPhone(414) 805-3000
Source: Dmand AI Affiliation Data
Dr. Christina Mariyam Joy is affiliated with 3 sites of care and 1 medical group
Dr. Mariyam Joy's primary practice is Froedtert Hospital in Milwaukee, Wisconsin, part of Froedtert ThedaCare Health. Dr. Mariyam Joy is also affiliated with Froedtert Menomonee Falls Hospital. The medical group on file is Froedtert & the Medical College of Wisconsin Community Physicians. Dmand AI also links Dr. Mariyam Joy to 1 more dialysis center, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Christina Mariyam Joy's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Mariyam Joy practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Froedtert Hospital | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
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Dr. Christina Mariyam Joy is one of 168 nephrologists in Wisconsin
Nephrology is Dr. Mariyam Joy's primary specialty in the NPI Registry, under taxonomy code 207RN0300X. Dr. Mariyam Joy is licensed in Wisconsin.
Specialties and state licenses
- Nephrology, WisconsinPrimary
Nephrologists near Dr. Mariyam Joy
Counts of nephrologists 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. Christina Mariyam Joy billed Medicare for 316 services in 2024
CMS data shows 316 Medicare services from Dr. Mariyam Joy across 7 procedure codes in 2024, for 137 Medicare patients. Medicare paid $19,362 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Mariyam Joy's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 3202024: 17446%
- Tests and treatments
- 2023: 1722024: 8650%
- Other services
- 2023: 02024: 56
Dr. Mariyam Joy compared with the Wisconsin median for nephrologists, 2024
- Dr. Mariyam Joy
- Wisconsin median
- Medicare services
- 316vs 67753% below
- Medicare patients
- 137vs 23642% below
- Part D claims
- 458vs 65130% below
Medians across 167 nephrologists in Wisconsin with Dmand AI profiles that report each measure.
Dr. Mariyam Joy'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 Dr. Mariyam Joy and other nephrologists in Wisconsin.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Christina Mariyam Joy treated 137 Medicare patients in 2024, average age 69
CMS counts 137 Medicare patients who saw Dr. Mariyam Joy in 2024. The largest group is 65 to 74, with 47 patients. 75% of them have chronic kidney disease, and 75% have high blood pressure. 27% are also on Medicaid. Their average risk score is 4.32, 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. Mariyam Joy's median patient age at 67, with 53% women.
Dr. Mariyam Joy's Medicare patients by age, 2024
Dr. Mariyam Joy's Medicare patients by sex, 2024
- Women6749%
- Men7051%
Chronic conditions among Dr. Mariyam Joy's Medicare patients, 2024
- Chronic kidney disease75%
- High blood pressure75%
- High cholesterol75%
- Heart failure58%
- Diabetes51%
- Atrial fibrillation50%
- Arthritis49%
- Ischemic heart disease43%
Share of Medicare patients with each condition. A patient can have several.
Dr. Mariyam Joy's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 67
Patient panel by sex, all payers
- Women53%
- Men47%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Christina Mariyam Joy wrote 629 Medicare Part D claims in 2024
In 2024, Dr. Mariyam Joy wrote 629 Medicare Part D claims for 117 patients. 82% of them were for generic drugs. CMS names the drug for 458 of them, across 17 drugs with 11 or more claims each, at $92,457 in total drug cost. In 2023, CMS named 271 claims across 11 drugs.
Dr. Mariyam Joy's Part D claims by kind of drug, 2024
- Generic517 claims82%
- Brand-name112 claims18%
Dr. Mariyam Joy'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. Mariyam Joy's Part D claims, 2024
- Antibiotics4%23 of 629 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: 2712024: 45869%
Drugs named by CMS: 17 in 2024, 11 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. Christina Mariyam Joy scored 88 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 88 out of 100 for Dr. Mariyam Joy for performance year 2024, reported as part of a group. Dr. Mariyam Joy accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Mariyam Joy as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Dr. Mariyam Joy's MIPS scores, performance year 2024
- 88of 100Final score
- 82.8of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
- 77of 100Cost
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. Christina Mariyam Joy received $671 in industry payments from 2021 to 2025
CMS Open Payments shows 15 general payments to Dr. Mariyam Joy from 8 drug and device companies from 2021 to 2025. Food and beverage make up the largest share, 100% of the total. Amgen Inc. paid the most, $214. It also lists 10 research payments totaling $1,375 in 2017.
General payments to Dr. Mariyam Joy by program year, 2021 to 2025
Companies that paid Dr. Mariyam Joy the most, 2021 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Christina Mariyam Joy'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) |
| 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 Dr. Christina Mariyam Joy
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. Christina Mariyam Joy's NPI number?
Dr. Christina Mariyam Joy's NPI number is 1639553605. It was assigned on July 19, 2015, and it is active in the NPI Registry.
What kind of doctor is Dr. Christina Mariyam Joy?
Dr. Christina Mariyam Joy is a nephrologist in Milwaukee, Wisconsin. The primary specialty in the NPI Registry is Nephrology Physician (taxonomy code 207RN0300X).
Where does Dr. Christina Mariyam Joy practice?
Dr. Mariyam Joy practices at 9200 W Wisconsin Ave, Milwaukee, WI 53226. Dr. Mariyam Joy's primary practice is Froedtert Hospital in Milwaukee, Wisconsin, part of Froedtert ThedaCare Health. Dmand AI also links Dr. Mariyam Joy to 1 dialysis center.
What is Dr. Christina Mariyam Joy's office phone number?
The practice phone on file for Dr. Mariyam Joy is (414) 805-3000.
What is Dr. Christina Mariyam Joy's medical license number?
Dr. Mariyam Joy holds Wisconsin license 76560.
Which hospitals is Dr. Christina Mariyam Joy affiliated with?
Dr. Mariyam Joy practices at Froedtert Hospital in Milwaukee, Wisconsin. Dr. Mariyam Joy is also affiliated with Froedtert Menomonee Falls Hospital.
What medical group is Dr. Christina Mariyam Joy part of?
Dr. Mariyam Joy is linked to Froedtert & the Medical College of Wisconsin Community Physicians.
Does Dr. Christina Mariyam Joy accept Medicare?
Yes. CMS data shows Dr. Mariyam Joy billed Medicare for 316 services in 2024, and Dr. Mariyam Joy accepts Medicare assignment.
Does Dr. Christina Mariyam Joy offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Mariyam Joy as offering telehealth services.
What is Dr. Christina Mariyam Joy's MIPS score?
Dr. Mariyam Joy's MIPS final score for performance year 2024 is 88 out of 100, reported as part of a group.
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How many Medicare patients does Dr. Christina Mariyam Joy see?
CMS counts 137 Medicare patients who saw Dr. Mariyam Joy in 2024, with an average age of 69.
What services does Dr. Christina Mariyam Joy bill to Medicare?
In 2024, Dr. Mariyam Joy's most billed Medicare services were hospital inpatient care (99232), medicare service (G2211) and dialysis (90935).
What drugs does Dr. Christina Mariyam Joy prescribe most?
In 2024 Medicare Part D data, Dr. Mariyam Joy's most prescribed drugs by claims were Amlodipine Besylate, Calcitriol and Furosemide.
Has Dr. Christina Mariyam Joy received payments from drug or device companies?
CMS Open Payments shows $671 in general payments to Dr. Mariyam Joy from 8 companies from 2021 to 2025. The largest total came from Amgen Inc.
How long has Dr. Christina Mariyam Joy been practicing?
Dr. Mariyam Joy graduated from medical school in 2011, 15 years ago.
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