Mark J. Nellenbach, PA-C
- Medicare patients, 2024
- 322
- Part D claims, 2024
- 228
- MIPS score, 2024
- 81
- Hospital affiliations
- 3
- Medical groups
- 4
- Practice address
- 9500 Euclid Avenue, Cleveland, OH 44195
- Practice phone
- Call (216) 952-9829
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Mark Nellenbach'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.
Mark J. Nellenbach is a physician assistant in Cleveland, Ohio
Mark Nellenbach practices at Cleveland Clinic Main Campus in Cleveland, Ohio, part of The Cleveland Clinic Foundation.
Mark Nellenbach's NPI, 1699258244, was assigned on September 10, 2018.
- NPI
- 1699258244NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3577807684
- NPI enumeration date
- September 10, 2018
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (216) 952-9829
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 34
- Medical school graduation
- 2018
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Mark J. Nellenbach practices at Cleveland Clinic Main Campus in Cleveland, Ohio
Mark Nellenbach's primary practice is Cleveland Clinic Main Campus, at 9500 Euclid Avenue, Cleveland, OH 44195 in Cuyahoga County. The practice phone is (216) 952-9829.
- Cleveland Clinic Main Campus9500 Euclid Avenue, Cleveland, OH 44195 · Cuyahoga CountyPhone(216) 952-9829
Source: Dmand AI Affiliation Data
Mark J. Nellenbach is affiliated with 5 sites of care and 4 medical groups
Mark Nellenbach's primary practice is Cleveland Clinic Main Campus in Cleveland, Ohio, part of The Cleveland Clinic Foundation. Mark Nellenbach is also affiliated with University Hospitals Cleveland Medical Center. The medical group on file is Cleveland Clinic. Dmand AI also links Mark Nellenbach to 1 more hospital, 3 medical groups and 2 clinical labs, each named with a free account. Mark Nellenbach's employer is on file too: a hospital.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Mark J. Nellenbach's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Mark Nellenbach practices, 5 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Cleveland Clinic Main Campus | Available with a free account |
| +4 more sites and 3 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Mark J. Nellenbach is one of 4,524 physician assistants in Ohio
Physician assistant is Mark Nellenbach's primary specialty in the NPI Registry, under taxonomy code 363A00000X. Mark Nellenbach has a license on file in Ohio.
Specialties and state licenses
- Physician assistant, Ohio
Physician assistants near Mark Nellenbach
Counts of physician assistants 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
Mark J. Nellenbach treated 322 Medicare patients in 2024, average age 74
CMS counts 322 Medicare patients who saw Mark Nellenbach in 2024. The largest group is 65 to 74, with 158 patients. 75% of them have high cholesterol, and 68% have high blood pressure. 7% are also on Medicaid. Their average risk score is 0.97, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Mark Nellenbach's median patient age at 44, with 60% women.
Mark Nellenbach's Medicare patients by age, 2024
Mark Nellenbach's Medicare patients by sex, 2024
- Women22068%
- Men10232%
Chronic conditions among Mark Nellenbach's Medicare patients, 2024
- High cholesterol75%
- High blood pressure68%
- Arthritis51%
- Anxiety28%
- Mood disorders27%
- Diabetes25%
- Depression22%
- Chronic kidney disease20%
Share of Medicare patients with each condition. A patient can have several.
Mark Nellenbach's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 44
Patient panel by sex, all payers
- Women60%
- Men39%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Mark J. Nellenbach wrote 228 Medicare Part D claims in 2024
In 2024, Mark Nellenbach wrote 228 Medicare Part D claims for 183 patients. 89% of them were for generic drugs.
Mark Nellenbach's Part D claims by kind of drug, 2024
- Generic204 claims89%
- Brand-name and other24 claims11%
Drug classes CMS tracks in Mark Nellenbach's Part D claims, 2024
- Antibiotics48%109 of 228 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
Mark J. Nellenbach scored 81 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 81 out of 100 for Mark Nellenbach for performance year 2024, reported as part of a group. Mark Nellenbach accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Mark Nellenbach's MIPS scores, performance year 2024
- 81of 100Final score
- 63.1of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
- 74of 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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Sources for Mark J. Nellenbach'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 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 (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) |
| 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 Mark J. Nellenbach
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Mark J. Nellenbach's NPI number?
Mark J. Nellenbach's NPI number is 1699258244. It was assigned on September 10, 2018, and it is active in the NPI Registry.
What does Mark J. Nellenbach specialize in?
Mark J. Nellenbach is a physician assistant in Cleveland, Ohio. The primary specialty in the NPI Registry is Physician Assistant (taxonomy code 363A00000X).
Where does Mark J. Nellenbach practice?
Mark Nellenbach practices at 9500 Euclid Avenue, Cleveland, OH 44195. Mark Nellenbach's primary practice is Cleveland Clinic Main Campus in Cleveland, Ohio, part of The Cleveland Clinic Foundation. Dmand AI also links Mark Nellenbach to 1 hospital, 3 medical groups and 2 clinical labs.
What is Mark J. Nellenbach's office phone number?
The practice phone on file for Mark Nellenbach is (216) 952-9829.
Which hospitals is Mark J. Nellenbach affiliated with?
Mark Nellenbach practices at Cleveland Clinic Main Campus in Cleveland, Ohio. Mark Nellenbach is also affiliated with University Hospitals Cleveland Medical Center. Dmand AI links Mark Nellenbach to 1 more hospital.
What medical group is Mark J. Nellenbach part of?
Mark Nellenbach is linked to Cleveland Clinic. Dmand AI links Mark Nellenbach to 3 more medical groups.
Does Mark J. Nellenbach accept Medicare?
Yes. CMS lists Mark Nellenbach as accepting Medicare assignment.
What is Mark J. Nellenbach's MIPS score?
Mark Nellenbach's MIPS final score for performance year 2024 is 81 out of 100, reported as part of a group.
How many Medicare patients does Mark J. Nellenbach see?
CMS counts 322 Medicare patients who saw Mark Nellenbach in 2024, with an average age of 74.
How long has Mark J. Nellenbach been practicing?
Mark Nellenbach graduated from medical school in 2018, 8 years ago.
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