NPI registry status
Active
2026 NPPES data Ophthalmology Physician NPI 1083622773 MD
Verify on CMS → Mark Johnson, MD
Ophthalmology Physician in Ann Arbor, Michigan.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 22,388 in Ophthalmology Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
77
Medicare Part D claims · 28 beneficiaries · Ophthalmology Physician avg: 1K
Generic prescribing
57%
generic claims · 43% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Mark Johnson, MD filed 77 Medicare Part D claims in 2024 as an Ophthalmology Physician in Ann Arbor, Michigan, prescribing 57% generic.
- 77
- Part D claims, 2024
- 57%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥0th
- pct by Part D claim volume (lower-bound band)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Federal trust snapshot
What official records show about Mark Johnson, MD
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1083622773), first enumerated 08/04/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 77 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Board certification signal
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- Reported
Hospital affiliations
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- State context
State board disciplinary context
Michigan statewide board action statistics are published annually — these figures describe aggregate state activity, not Mark Johnson, MD's individual license status. Verify directly with the state medical board.
Source: MI-BOM annual report 2023
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1083622773 · Ophthalmology Physician
NPI-10 · ENUM-LEGACY · TAX-MID · RX-TRACE · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1083622773
- ENUM-LEGACY 2006
- TAX-MID 22K Ophthalmology Physician
- RX-TRACE 77
- BOOK-LIGHT 773 in Michigan
- PHOTO-ENUM Richard Hopp, MD · 2006
Mark Johnson, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
77 ≥ 0th percentile 0% of 1,416,883 prescribers are in lower value bands
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2024
✓
Board certification likely (heuristic, not verified)
Mark Johnson, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Mark Johnson, MD?
Quality data not reportedPrimary specialty
Ophthalmology Physician
Medicare Part D claims
77 95% vs specialty avg
Specialty distribution in Michigan
How Ophthalmology Physician compares to other specialties among Michigan providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Ophthalmology Physician. Verify directly:
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Practice Address
Provider Details
| NPI | 1083622773 |
|---|---|
| Specialty | Ophthalmology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 08/04/2006 |
Hospital and facility affiliations
Facilities where Mark Johnson, MD bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Regents OF The University OF Michigan
Ann Arbor, MI
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
License & disciplinary context - Michigan MI-BOM 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~41K Michigan medical licensees in 2023 - they are NOT specific to Mark Johnson, MD. To verify Mark Johnson, MD's current license status, search the MI-BOM public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
123
Total board actions, Michigan 2023
Across 120 cases
3.00
Actions per 1,000 licensees
Michigan statewide rate
probation
Most common action type
44 cases
MI-BOM publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the Michigan disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Above average
Mark Johnson, MD - brand share 43.0%
Ophthalmology Physician average
43% brand-name claims vs 57% generic, on 77 2024 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2024.
77
Total Claims
$6K
Total Drug Cost
28
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 163.1
- Total Day Supply
- 4,780
- Brand vs Generic
- 43% brand / 57% generic
- Brand Drug Cost
- $5K
- Generic Drug Cost
- $1K
Patient Demographics
- Average Patient Age
- 76.3 years
- Avg HCC Risk Score
- 1.15
- Gender Split
- 54% female / 46% male
- Age Distribution
- <65: 0, 65-74: 13, 75-84: N/A, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Mark Johnson, MD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Prednisolone Acetate
Prednisolone Acetate
23 claims
- Timolol Maleate
Timolol Maleate
15 claims
- Ketorolac Trometha…
Ketorolac Tromethamine
14 claims
| Drug | Claims |
|---|---|
| Prednisolone Acetate | 23 |
| Timolol Maleate | 15 |
| Ketorolac Tromethamine | 14 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Ophthalmology Physician Overview
How Mark Johnson, MD fits within the Ophthalmology Physician landscape nationally.
22,388
Ophthalmology Physician Providers in US
56
States with Ophthalmology Physician
1,490
Avg Claims per Provider
Mark Johnson, MD's 77 claims are below the specialty average of 1,490.
Nationwide Ophthalmology Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Johnson, both outside Michigan so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Ophthalmology Physician Providers in Michigan
Other clinicians with the same primary specialty enrolled in Michigan, drawn from the same CMS NPPES roster as Johnson.
One of 773 Ophthalmology Physician providers enrolled in Michigan, 5 are shown here.
Dr. Thomas Aaberg
MD
Grand Rapids, MI
Dr. Munzer Abdulhak
M.D.
Portage, MI
Dr. Gary Abrams
MD
Detroit, MI
Dr. James Adams
MD
Ypsilanti, MI
Dr. Howard Adelson
D.O.
Northville, MI
Compare Ophthalmology Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Mark Johnson, MD's specialty? ▼
Mark Johnson, MD specializes in Ophthalmology Physician and practices in Ann Arbor, Michigan. Credentials: MD.
How much does Mark Johnson, MD prescribe under Medicare Part D? ▼
In 2024, Mark Johnson, MD wrote 77 Medicare Part D claims totaling $6K in drug costs for 28 beneficiaries.
Where is Mark Johnson, MD located? ▼
Mark Johnson, MD is located at 1000 WALL STREET, Ann Arbor, MI, 48105. Phone: (734) 764-4190.
What is Mark Johnson, MD's NPI number? ▼
Mark Johnson, MD's National Provider Identifier (NPI) is 1083622773, issued on 08/04/2006.
Does Mark Johnson, MD prescribe more brand-name or generic drugs? ▼
Mark Johnson, MD's prescribing is 43% brand-name and 57% generic drugs by claim count, with $5K in brand drug costs.
How many Ophthalmology Physician providers are there in the US? ▼
There are 22,388 Ophthalmology Physician providers across 56 states in the US. The average Ophthalmology Physician provider writes 1,490 Medicare Part D claims per year.
What drugs does Mark Johnson, MD prescribe most often? ▼
Based on 2024 Medicare Part D data, Mark Johnson, MD's most frequently prescribed drugs include Prednisolone Acetate, Timolol Maleate, Ketorolac Tromethamine. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Mark Johnson, MD accept Medicare? ▼
Mark Johnson, MD appears in CMS Medicare data with 77 Part D claims and 28 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Mark Johnson, MD's credentials? ▼
Mark Johnson, MD's NPI is 1083622773 with credentials MD. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2024). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of August 2026 (NPPES) / 2024 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of August 2026.