2026 NPPES data Surgery Physician NPI 1144885286 DO
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Timothy Diaz, DO

Surgery Physician in Terre Haute, Indiana. This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 36,191 in Surgery 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
29
Medicare Part D claims · 16 beneficiaries · Surgery Physician avg: 169
Industry payments
$484.17
5 payments · CMS Open Payments (Sunshine Act)
Compiled from official public sources by the PlainDoctor editorial team.

What the federal data shows

Timothy Diaz, DO filed 29 Medicare Part D claims in 2023 as a Surgery Physician in Terre Haute, Indiana.

29
Part D claims, 2023
$484.17
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.

Timothy Diaz, DO's Medicare Part D volume vs every U.S. prescriber

Total Medicare Part D claims, 2023, across all CMS prescribers nationally

29 0th percentile higher than 0% of 1,370,886 prescribers

0–200: 670,926 prescribers (49%). This entry sits in this band. 200–400: 182,923 prescribers (13%). Above this entry. 400–600: 90,619 prescribers (7%). Above this entry. 600–800: 56,224 prescribers (4%). Above this entry. 800–1,000: 40,919 prescribers (3%). Above this entry. 1,000–1,200: 31,827 prescribers (2%). Above this entry. 1,200–1,400: 26,224 prescribers (2%). Above this entry. 1,400–1,600: 21,710 prescribers (2%). Above this entry. 1,600–1,800: 19,072 prescribers (1%). Above this entry. 1,800–2,000: 16,451 prescribers (1%). Above this entry. 2K+: 213,991 prescribers (16%). Above this entry. This provider 0 2K+ every Part D prescriber (claims/yr), bucketed by value

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.

Source CMS Medicare Part D Prescriber Public Use File · 2023

Board-eligible specialty (heuristic, not verified)

Timothy Diaz, DO practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).

What does the federal data show about Timothy Diaz, DO?

Quality data not reported

NPI registry status

Active

Issued 05/03/2019

NPI 1144885286

Primary specialty

Surgery Physician

Mid-sized

36,191 US NPIs in this specialty

Medicare Part D claims

29 83% vs specialty avg

2023 prescription claims

Specialty avg: 169

Specialty distribution in Indiana

How Surgery Physician compares to other specialties among Indiana providers

Indiana providers

Largest specialties in Indiana (% of in-state providers)

Behavior Technician - 13.6%Behavior Technician13.6%Student in an Organized Health Care Education/Training Program - 4.7%Student in an Organized Health Care Education/Training Program4.7%Pharmacist - 4.3%Pharmacist4.3%Family Nurse Practitioner - 4.2%Family Nurse Practitioner4.2%Clinical Social Worker - 4.2%Clinical Social Worker4.2%Mental Health Counselor - 4.1%Mental Health Counselor4.1%Surgery Physician - 0.5%Surgery Physician0.5%
Largest specialties in Indiana (% of in-state 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 Surgery Physician. Verify directly:

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).

Timothy Diaz, DO appears in the CMS NPPES registry as a Surgery Physician provider holding DO credentials at 1818 N 6TH ST, Terre Haute, IN, 47804, with a listed phone of (812) 232-1123. NPI 1144885286 was issued on 05/03/2019. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what Diaz most recently submitted to CMS rather than a vetted directory listing, which is why patients should always confirm the practice is still at this location before scheduling.

Medicare Part D records for calendar year 2023 show 29 prescription claims written by this provider, covering 16 Medicare beneficiaries and totaling roughly $4K in drug spend. These figures capture only Medicare Part D, commercial insurance, Medicaid, and cash-pay prescriptions are not included, and any drug-beneficiary cell under 11 is suppressed by CMS for patient privacy.

Surgery Physician is a mid-sized specialty nationwide, with 36,191 enrolled providers across 56 states and an average of 169 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

1818 N 6TH ST
Terre Haute, IN 47804

Provider Details

NPI 1144885286
Specialty Surgery Physician
Credentials DO
Gender Male
NPI Issued 05/03/2019

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 Timothy Diaz, DO. Source: openpaymentsdata.cms.gov.

Total received

$484

Largest payer

Boston Scientific Corporation

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 2023.

29
Total Claims
$4K
Total Drug Cost
16
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
37
Total Day Supply
526
Generic Drug Cost
$154

Patient Demographics

Average Patient Age
71.6 years
Avg HCC Risk Score
3.69

Top Prescribed Drugs (Medicare Part D)

Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.

Drug Claims
Ibuprofen
11

* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.

Surgery Physician Overview

How Timothy Diaz, DO fits within the Surgery Physician landscape nationally.

36,191
Surgery Physician Providers in US
56
States with Surgery Physician
169
Avg Claims per Provider

Timothy Diaz, DO's 29 claims are below the specialty average of 169.

Nearby Surgery Physician Providers in Indiana

Other clinicians with the same primary specialty enrolled in Indiana, drawn from the same CMS NPPES roster as Diaz.

Compare Surgery 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 Indiana medical board, federal registration is not a license check. Credential verification guide
  • Weigh a second option: compare this provider with a nearby Surgery 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.

Frequently Asked Questions

What is Timothy Diaz, DO's specialty?
Timothy Diaz, DO specializes in Surgery Physician and practices in Terre Haute, Indiana. Credentials: DO.
How much does Timothy Diaz, DO prescribe under Medicare Part D?
In 2023, Timothy Diaz, DO wrote 29 Medicare Part D claims totaling $4K in drug costs for 16 beneficiaries.
Where is Timothy Diaz, DO located?
Timothy Diaz, DO is located at 1818 N 6TH ST, Terre Haute, IN, 47804. Phone: (812) 232-1123.
What is Timothy Diaz, DO's NPI number?
Timothy Diaz, DO's National Provider Identifier (NPI) is 1144885286, issued on 05/03/2019.
How many Surgery Physician providers are there in the US?
There are 36,191 Surgery Physician providers across 56 states in the US. The average Surgery Physician provider writes 169 Medicare Part D claims per year.
What drugs does Timothy Diaz, DO prescribe most often?
Based on 2023 Medicare Part D data, Timothy Diaz, DO's most frequently prescribed drugs include Ibuprofen. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Timothy Diaz, DO accept Medicare?
Timothy Diaz, DO appears in CMS Medicare data with 29 Part D claims and 16 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Timothy Diaz, DO's credentials?
Timothy Diaz, DO's NPI is 1144885286 with credentials DO. 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

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.
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.