NPI registry status
Active
2026 NPPES data Hematology (Internal Medicine) Physician NPI 1235219577 MD
Verify on CMS → Mark Udden, MD
Hematology (Internal Medicine) Physician in Houston, Texas.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 1,451 in Hematology (Internal Medicine) 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
278
Medicare Part D claims · 73 beneficiaries · Hematology (Internal Medicine) Physician avg: 693
Generic prescribing
0%
generic claims · 51% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
84.1/100
▲ 1 pts above national avg 83.1 · Above neutral
Industry payments
$85
1 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Mark Udden, MD reported a CMS MIPS final score of 84.1/100 - above the 83.1 national average - and filed 278 Medicare Part D claims in 2023.
- 84.1/100
- MIPS score · +1 vs avg
- 278
- Part D claims, 2023
- 0%
- generic prescribing
- Likely
- board-certified (heuristic)
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.
Mark Udden, MD's MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
84 45th percentile higher than 45% of 477,587 scored providers
Each bar is a band; taller bars hold more scored 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.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where Mark Udden, MD sits
This provider among hematology (internal medicine) physician peers
Across the 570 hematology (internal medicine) physician providers who report both Medicare Part D prescribing and a MIPS quality score, Mark Udden, MD writes more Part D claims than 32% of them and scores higher on MIPS quality than 53% - placing this provider in the lower-volume, high-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Part D claim volume vs MIPS quality, by specialty percentile
Each dot is one hematology (internal medicine) physician peer from a representative sample of 60; the gold marker is Mark Udden, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Mark Udden, 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 Udden, MD?
Near national averagePrimary specialty
Hematology (Internal Medicine) Physician
Medicare Part D claims
278 60% vs specialty avg
MIPS final score
84.1/100 1 pts vs avg
Specialty distribution in Texas
How Hematology (Internal Medicine) Physician compares to other specialties among Texas providers
Medicare quality performance, MIPS
Mark Udden, MD's 2023 MIPS final score plotted against the Hematology (Internal Medicine) Physician national average
- MIPS Final Score
- 84.1/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Hematology (Internal Medicine) Physician) - 84.1/100 vs national avg 83.1
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).
Mark Udden, MD appears in the CMS NPPES registry as a Hematology (Internal Medicine) Physician provider holding MD credentials at 1504 TAUB LOOP, Houston, TX, 77030, with a listed phone of (713) 873-8890. NPI 1235219577 was issued on 10/17/2006.
Medicare Part D records for calendar year 2023 show 278 prescription claims written by this provider, covering 73 Medicare beneficiaries and totaling roughly $1.5 million in drug spend, split 51% brand-name and 0% generic by claim count, with an opioid prescribing rate of 13.7%. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 84.1/100 for the 2023 performance year (Quality 84.5, Cost 54.4), compared with the national average of 83.1.
Hematology (Internal Medicine) Physician is a narrow specialty nationwide, with 1,451 enrolled providers across 50 states and an average of 693 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.
Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1235219577 |
|---|---|
| Specialty | Hematology (Internal Medicine) Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 10/17/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
84.059
Final Score
Avg: 83.1
84.4904
Quality
54.3968
Cost
Reporting: Group practice
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 Udden, MD. Source: openpaymentsdata.cms.gov.
Total received
$85
Largest payer
Alexion Pharmaceuticals, Inc.
Most common payment type
Education
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.
License & disciplinary context - Texas TMB 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 ~77K Texas medical licensees in 2023 - they are NOT specific to Mark Udden, MD. To verify Mark Udden, MD's current license status, search the TMB public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
344
Total board actions, Texas 2023
Across 334 cases
4.47
Actions per 1,000 licensees
Texas statewide rate
probation
Most common action type
94 cases
TMB 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 Texas disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Brand-heavy
Mark Udden, MD - brand share 51.0%
Hematology (Internal Medicine) Physician average
51% brand-name claims vs 0% generic, on 278 2023 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 2023.
278
Total Claims
$1.5M
Total Drug Cost
73
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 343
- Total Day Supply
- 9,415
- Brand vs Generic
- 51% brand / 0% generic
- Brand Drug Cost
- $1.4M
- Opioid Claims
- 38 (13.7% rate)
Patient Demographics
- Average Patient Age
- 65.0 years
- Avg HCC Risk Score
- 2.32
- Gender Split
- 49% female / 51% male
- Age Distribution
- <65: 27, 65-74: 32, 75-84: N/A, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Mark Udden, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Imbruvica
Imbruvica
31 claims
- Hydrocodone-Acetam…
Hydrocodone-Acetaminophen
30 claims
- Hydroxyurea
Hydroxyurea
30 claims
- Eliquis
Eliquis
27 claims
- Jakafi
Jakafi
21 claims
- Xarelto
Xarelto
17 claims
- Bosulif 12
Bosulif
12 claims
- Dexamethasone 12
Dexamethasone
12 claims
| Drug | Claims |
|---|---|
| Imbruvica Ibrutinib | 31 |
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 30 |
| Hydroxyurea | 30 |
| Eliquis Apixaban | 27 |
| Jakafi Ruxolitinib Phosphate | 21 |
| Xarelto Rivaroxaban | 17 |
| Bosulif Bosutinib | 12 |
| Dexamethasone | 12 |
| Imatinib Mesylate | 12 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Hematology (Internal Medicine) Physician in TX →
All providers in Texas →
Compare specialties →
Hematology (Internal Medicine) Physician Overview
How Mark Udden, MD fits within the Hematology (Internal Medicine) Physician landscape nationally.
1,451
Hematology (Internal Medicine) Physician Providers in US
50
States with Hematology (Internal Medicine) Physician
693
Avg Claims per Provider
Mark Udden, MD's 278 claims are below the specialty average of 693.
Nearby Hematology (Internal Medicine) Physician Providers in Texas
Other clinicians with the same primary specialty enrolled in Texas, drawn from the same CMS NPPES roster as Udden.
Dr. Mohammad Abdulla
MD
Houston, TX
Dr. Aimaz Afrough
M.D.
Dallas, TX
Dr. Yosra Aljawai
M.D.
Houston, TX
Dr. Nitya Alluri
MD
Austin, TX
Dr. Effrosyni Apostolidou
MD, PHD
Houston, TX
Compare Hematology (Internal Medicine) Physician nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the Texas medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Hematology (Internal Medicine) Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
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Frequently Asked Questions
What is Mark Udden, MD's specialty? ▼
Mark Udden, MD specializes in Hematology (Internal Medicine) Physician and practices in Houston, Texas. Credentials: MD.
How much does Mark Udden, MD prescribe under Medicare Part D? ▼
In 2023, Mark Udden, MD wrote 278 Medicare Part D claims totaling $1.5M in drug costs for 73 beneficiaries.
What is Mark Udden, MD's Medicare quality score? ▼
Mark Udden, MD has a CMS MIPS Final Score of 84.1/100 (Quality: 84.5, Cost: 54.4). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Mark Udden, MD located? ▼
Mark Udden, MD is located at 1504 TAUB LOOP, Houston, TX, 77030. Phone: (713) 873-8890.
What is Mark Udden, MD's NPI number? ▼
Mark Udden, MD's National Provider Identifier (NPI) is 1235219577, issued on 10/17/2006.
Does Mark Udden, MD prescribe more brand-name or generic drugs? ▼
Mark Udden, MD's prescribing is 51% brand-name and 0% generic drugs by claim count, with $1.4M in brand drug costs.
Does Mark Udden, MD prescribe opioids? ▼
Yes, Mark Udden, MD had 38 opioid claims in 2023 with an opioid prescribing rate of 13.7%.
How many Hematology (Internal Medicine) Physician providers are there in the US? ▼
There are 1,451 Hematology (Internal Medicine) Physician providers across 50 states in the US. The average Hematology (Internal Medicine) Physician provider writes 693 Medicare Part D claims per year.
What drugs does Mark Udden, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Mark Udden, MD's most frequently prescribed drugs include Imbruvica, Hydrocodone-Acetaminophen, Hydroxyurea. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Mark Udden, MD accept Medicare? ▼
Mark Udden, MD appears in CMS Medicare data with 278 Part D claims and 73 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Mark Udden, MD's credentials? ▼
Mark Udden, MD's NPI is 1235219577 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 (2023). 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 April 2026 (NPPES) / 2023 (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
Compiled from official public sources by the PlainDoctor editorial team.
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 May 2026.