NPI registry status
Active
2026 NPPES data Rheumatology Physician NPI 1659365211 MD
Verify on CMS → Mark Malyak, MD
Rheumatology Physician in Denver, Colorado.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 6,377 in Rheumatology 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
172
Medicare Part D claims · 105 beneficiaries · Rheumatology Physician avg: 2K
MIPS score
89.3/100
▲ 6 pts above national avg 83.5 · Exceptional
Industry payments
$17.01
1 payments · CMS Open Payments (Sunshine Act)
What the federal data shows
Mark Malyak, MD reported a CMS MIPS final score of 89.3/100 - above the 83.5 national average - and filed 172 Medicare Part D claims in 2024.
- 89.3/100
- MIPS score · +6 vs avg
- 172
- Part D claims, 2024
- Likely
- board-certified (heuristic)
- ≥56th
- pct among measured MIPS (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 Malyak, MD
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 1659365211), first enumerated 09/09/2005.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 172 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 89.3/100 in the Quality Payment Program — a federal quality measure, not a patient review.
Source: CMS Quality Payment Program
- 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
Industry payment transparency
$17.01 in reported industry payments (1 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 1659365211 · Rheumatology Physician
NPI-10 · ENUM-LEGACY · TAX-MID · MIPS-ABOVE · RX-LIGHT · BOOK-THIN · PHOTO-FINISH
- NPI-10 1659365211
- ENUM-LEGACY 2005
- TAX-MID 6K Rheumatology Physician
- MIPS-ABOVE 89.3/100
- RX-LIGHT 172
- BOOK-THIN 120 in Colorado
- PHOTO-FINISH Russell Branum · ±0.0
MIPS final-score neighbourhood
Same-specialty nationwide peers by CMS final score, not geographic proximity
- James Esther · l…
James Esther
89.2 MIPS pts
- Malyak · this pr…
Malyak · this provider
89.3 MIPS pts
- Russell Branum ·…
Russell Branum
89.3 MIPS pts
- Bob Wodecki · near
Bob Wodecki
89.3 MIPS pts
What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).
Mark Malyak, MD'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.
89 ≥ 56th percentile 56% 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 Mark Malyak, MD sits
This provider among rheumatology physician peers
Across the 1,970 rheumatology physician providers who report both Medicare Part D prescribing and a MIPS quality score, Mark Malyak, MD writes more Part D claims than 5% of them and scores higher on MIPS quality than 55% - placing this provider in the lower-volume, high-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Each dot is one rheumatology physician peer from a representative sample of 60; the gold marker is Mark Malyak, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Mark Malyak, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting - 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 Malyak, MD?
High performer (top quartile)Primary specialty
Rheumatology Physician
Medicare Part D claims
172 92% vs specialty avg
MIPS final score
89.3/100 5.8 pts vs avg
Specialty distribution in Colorado
How Rheumatology Physician compares to other specialties among Colorado providers
Medicare quality performance, MIPS
Mark Malyak, MD's 2023 MIPS final score plotted against the Rheumatology Physician national average
- MIPS Final Score
- 89.3/100
- 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 | 1659365211 |
|---|---|
| Specialty | Rheumatology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 09/09/2005 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
89.2834
Final Score
Measured-score avg: 83.5
80.5153
Quality
100
Promoting Interoperability
Reporting: Individual
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 Mark Malyak, MD. Source: openpaymentsdata.cms.gov.
Total received
$17
Largest payer
ABBVIE 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.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2024.
172
Total Claims
$221K
Total Drug Cost
105
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 334.633
- Total Day Supply
- 9,904
- Generic Drug Cost
- $4K
Patient Demographics
- Average Patient Age
- 74.4 years
- Avg HCC Risk Score
- 1.81
- Gender Split
- 69% female / 31% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Mark Malyak, MD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Hydroxychloroquine…
Hydroxychloroquine Sulfate
32 claims
- Prednisone
Prednisone
20 claims
- Methotrexate
Methotrexate
16 claims
| Drug | Claims |
|---|---|
| Hydroxychloroquine Sulfate | 32 |
| Prednisone | 20 |
| Methotrexate Methotrexate Sodium | 16 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Rheumatology Physician Overview
How Mark Malyak, MD fits within the Rheumatology Physician landscape nationally.
6,377
Rheumatology Physician Providers in US
52
States with Rheumatology Physician
2,058
Avg Claims per Provider
Mark Malyak, MD's 172 claims are below the specialty average of 2,058.
Nationwide Rheumatology Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Malyak, both outside Colorado so the neighborhoods are not geographic containment.
Similar MIPS final score
Nearest same-specialty clinicians by CMS MIPS final score (89.3 here).
Same NPPES enumeration year (2005)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Rheumatology Physician Providers in Colorado
Other clinicians with the same primary specialty enrolled in Colorado, drawn from the same CMS NPPES roster as Malyak.
One of 120 Rheumatology Physician providers enrolled in Colorado, 5 are shown here.
Phyllis Acker
RN
Lafayette, CO
Dr. Vivianne Allsop
MD
Denver, CO
Dr. Bjorn Anderson
MD
Denver, CO
Dr. Christopher Antolini
MD
Denver, CO
Dr. Elizabeth Arena
DO, MPH
Grand Junction, CO
Compare Rheumatology Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Mark Malyak, MD's specialty? ▼
Mark Malyak, MD specializes in Rheumatology Physician and practices in Denver, Colorado. Credentials: MD.
How much does Mark Malyak, MD prescribe under Medicare Part D? ▼
In 2024, Mark Malyak, MD wrote 172 Medicare Part D claims totaling $221K in drug costs for 105 beneficiaries.
What is Mark Malyak, MD's Medicare quality score? ▼
Mark Malyak, MD has a CMS MIPS Final Score of 89.3/100 (Quality: 80.5). 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 Mark Malyak, MD located? ▼
Mark Malyak, MD is located at 2821 E CEDAR AVE APT 4, Denver, CO, 80209. Phone: (303) 781-4198.
What is Mark Malyak, MD's NPI number? ▼
Mark Malyak, MD's National Provider Identifier (NPI) is 1659365211, issued on 09/09/2005.
How many Rheumatology Physician providers are there in the US? ▼
There are 6,377 Rheumatology Physician providers across 52 states in the US. The average Rheumatology Physician provider writes 2,058 Medicare Part D claims per year.
What drugs does Mark Malyak, MD prescribe most often? ▼
Based on 2024 Medicare Part D data, Mark Malyak, MD's most frequently prescribed drugs include Hydroxychloroquine Sulfate, Prednisone, Methotrexate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Mark Malyak, MD accept Medicare? ▼
Mark Malyak, MD appears in CMS Medicare data with 172 Part D claims and 105 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Mark Malyak, MD's credentials? ▼
Mark Malyak, MD's NPI is 1659365211 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.
- 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.