NPI registry status
Active
2026 NPPES data Specialist NPI 1619975182 M.D.
Verify on CMS → Johnny Chang, M.D.
Specialist in Middletown, Connecticut.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 69,567 in Specialist, 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
6K
Medicare Part D claims · 1K beneficiaries · Specialist avg: 2K
Generic prescribing
91%
generic claims · 9% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
83.3/100
▼ 0 pts below national avg 83.5 · Above neutral
Industry payments
$584.01
19 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Johnny Chang, M.D. reported a CMS MIPS final score of 83.3/100 - below the 83.5 national average - and filed 5,935 Medicare Part D claims in 2024.
- 83.3/100
- MIPS score · 0 vs avg
- 6K
- Part D claims, 2024
- 91%
- generic prescribing
- $584.01
- industry payments (Sunshine Act)
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 Johnny Chang, M.D.
Federal records show an active NPI with both Medicare prescribing volume and a measured CMS quality score — objective registry data, not patient reviews.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1619975182), first enumerated 07/08/2005.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 5,935 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
CMS quality reporting (MIPS)
Reported a CMS MIPS final score of 83.3/100 in the Quality Payment Program — a federal quality measure, not a patient review.
Source: CMS Quality Payment Program
- Reported
Hospital affiliations
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- Reported
Industry payment transparency
$584.01 in reported industry payments (19 transfers) in 2024 under the federal Sunshine Act — disclosed transfers of value, not a quality rating.
Source: CMS Open Payments
- 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 1619975182 · Specialist
NPI-10 · ENUM-LEGACY · TAX-MEGA · MIPS-INLINE · RX-MID · BOOK-LIGHT · PHOTO-FINISH
- NPI-10 1619975182
- ENUM-LEGACY 2005
- TAX-MEGA 70K Specialist
- MIPS-INLINE 83.3/100
- RX-MID 5,935
- BOOK-LIGHT 519 in Connecticut
- PHOTO-FINISH William Zollinger, M… · ±0.0
MIPS final-score neighbourhood
Same-specialty nationwide peers by CMS final score, not geographic proximity
- Chang · this pro…
Chang · this provider
83.3 MIPS pts
- Kenneth Pechman,…
Kenneth Pechman, M.D.
83.3 MIPS pts
- William Zollinge…
William Zollinger, M.D.
83.3 MIPS pts
- Banji Awosika, M…
Banji Awosika, MD
83.3 MIPS pts
- Melanie Costa, M…
Melanie Costa, M.D.
83.3 MIPS pts
What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).
Johnny Chang, M.D.'s MIPS score vs every measured U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure. Clinicians whose score CMS assigned without scoring any category are excluded.
83 ≥ 39th percentile 39% of 454,083 measured providers are in lower value bands
Each bar is a band; taller bars hold more measured providers. 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 whole-score-point band: it counts only measured clinicians in lower score bands. A CMS MIPS metric is not a recommendation or a clinical-quality rating by PlainDoctor. See methodology § corpus placement.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where Johnny Chang, M.D. sits
This provider among specialist peers
Across the 4,261 specialist providers who report both Medicare Part D prescribing and a MIPS quality score, Johnny Chang, M.D. writes more Part D claims than 92% of them and scores higher on MIPS quality than 48% - placing this provider in the high-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Each dot is one specialist peer from a representative sample of 60; the gold marker is Johnny Chang, M.D.. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
What does the federal data show about Johnny Chang, M.D.?
Near national averagePrimary specialty
Specialist
Medicare Part D claims
5,935 289% vs specialty avg
MIPS final score
83.3/100 0.2 pts vs avg
Specialty distribution in Connecticut
How Specialist compares to other specialties among Connecticut providers
Medicare quality performance, MIPS
Johnny Chang, M.D.'s 2023 MIPS final score plotted against the Specialist national average
- MIPS Final Score
- 83.3/100
- vs 83.5 national avg · 2023 performance year
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 | 1619975182 |
|---|---|
| Specialty | Specialist |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 07/08/2005 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
83.3087
Final Score
Measured-score avg: 83.5
72.1678
Quality
56.9026
Cost
100
Promoting Interoperability
Reporting: Group practice
Hospital and facility affiliations
Facilities where Johnny Chang, M.D. 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.
Mhs Primary Care, Inc.
Middletown, CT
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Johnny Chang, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$584
Largest payer
Sumitomo Pharma America, Inc.
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
Brand vs generic prescribing mix · Generic-heavy
Johnny Chang, M.D. - brand share 9.0%
Specialist average
9% brand-name claims vs 91% generic, on 5,935 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.
5,935
Total Claims
$596K
Total Drug Cost
1,126
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 13,969.267
- Total Day Supply
- 412,352
- Brand vs Generic
- 9% brand / 91% generic
- Brand Drug Cost
- $470K
- Generic Drug Cost
- $126K
- Opioid Claims
- 29 (0.5% rate)
- Antibiotic Claims
- 149
Patient Demographics
- Average Patient Age
- 74.3 years
- Avg HCC Risk Score
- 1.41
- Gender Split
- 17% female / 83% male
- Age Distribution
- <65: 96, 65-74: 475, 75-84: 423, 85+: 132
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Johnny Chang, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2024
- Finasteride
Finasteride
1,970 claims
- Tamsulosin Hcl
Tamsulosin Hcl
1,240 claims
- Dutasteride 781
Dutasteride
781 claims
- Oxybutynin Chlorid… 523
Oxybutynin Chloride Er
523 claims
- Myrbetriq 277
Myrbetriq
277 claims
- Gemtesa 179
Gemtesa
179 claims
- Methenamine Hippur… 151
Methenamine Hippurate
151 claims
- Solifenacin Succin… 120
Solifenacin Succinate
120 claims
| Drug | Claims |
|---|---|
| Finasteride | 1,970 |
| Tamsulosin Hcl | 1,240 |
| Dutasteride | 781 |
| Oxybutynin Chloride Er Oxybutynin Chloride | 523 |
| Myrbetriq Mirabegron | 277 |
| Gemtesa Vibegron | 179 |
| Methenamine Hippurate | 151 |
| Solifenacin Succinate | 120 |
| Oxybutynin Chloride | 98 |
| Alfuzosin Hcl Er Alfuzosin Hcl | 94 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Specialist Overview
How Johnny Chang, M.D. fits within the Specialist landscape nationally.
69,567
Specialist Providers in US
55
States with Specialist
1,524
Avg Claims per Provider
Johnny Chang, M.D.'s 5,935 claims are above the specialty average of 1,524.
Nationwide Specialist peers with similar MIPS or enrollment year
Two federal-record peer sets for Chang, both outside Connecticut so the neighborhoods are not geographic containment.
Similar MIPS final score
Nearest same-specialty clinicians by CMS MIPS final score (83.3 here).
Same NPPES enumeration year (2005)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Specialist Providers in Connecticut
Other clinicians with the same primary specialty enrolled in Connecticut, drawn from the same CMS NPPES roster as Chang.
One of 519 Specialist providers enrolled in Connecticut, 5 are shown here.
Dr. Jay Abbott
M.D.
Litchfield, CT
Dr. Karen Abrams
M.D.
Westport, CT
Micheal Acocella
B.S., P.T.
Greenwich, CT
Dr. Diana Adams
M.D.
Greenwich, CT
Dr. Zosimo Adefuin
MD
Bridgeport, CT
Compare Specialist nationally: see state-by-state distribution →
Frequently Asked Questions
What is Johnny Chang, M.D.'s specialty? ▼
Johnny Chang, M.D. specializes in Specialist and practices in Middletown, Connecticut. Credentials: M.D..
How much does Johnny Chang, M.D. prescribe under Medicare Part D? ▼
In 2024, Johnny Chang, M.D. wrote 5,935 Medicare Part D claims totaling $596K in drug costs for 1,126 beneficiaries.
What is Johnny Chang, M.D.'s Medicare quality score? ▼
Johnny Chang, M.D. has a CMS MIPS Final Score of 83.3/100 (Quality: 72.2, Cost: 56.9). The average MIPS Final Score across the 454,083 clinicians with at least one published category score is 83.5; clinicians whose score CMS assigned without scoring any category are excluded from that average. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Johnny Chang, M.D. located? ▼
Johnny Chang, M.D. is located at 410 SAYBROOK RD, Middletown, CT, 06457. Phone: (860) 358-2270.
What is Johnny Chang, M.D.'s NPI number? ▼
Johnny Chang, M.D.'s National Provider Identifier (NPI) is 1619975182, issued on 07/08/2005.
Does Johnny Chang, M.D. prescribe more brand-name or generic drugs? ▼
Johnny Chang, M.D.'s prescribing is 9% brand-name and 91% generic drugs by claim count, with $470K in brand drug costs.
Does Johnny Chang, M.D. prescribe opioids? ▼
Yes, Johnny Chang, M.D. had 29 opioid claims in 2024 with an opioid prescribing rate of 0.5%.
How many Specialist providers are there in the US? ▼
There are 69,567 Specialist providers across 55 states in the US. The average Specialist provider writes 1,524 Medicare Part D claims per year.
What drugs does Johnny Chang, M.D. prescribe most often? ▼
Based on 2024 Medicare Part D data, Johnny Chang, M.D.'s most frequently prescribed drugs include Finasteride, Tamsulosin Hcl, Dutasteride. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Johnny Chang, M.D. accept Medicare? ▼
Johnny Chang, M.D. appears in CMS Medicare data with 5,935 Part D claims and 1,126 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Johnny Chang, M.D.'s credentials? ▼
Johnny Chang, M.D.'s NPI is 1619975182 with credentials M.D.. 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.
- Quality Performance
- CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
- 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.