NPI registry status
Active
2026 NPPES data Orthopaedic Surgery Physician NPI 1477617025 D.O.
Verify on CMS → Tony Chien, D.O.
Orthopaedic Surgery Physician in Saint Louis, Missouri.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 25,775 in Orthopaedic 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
5K
Medicare Part D claims · 305 beneficiaries · Orthopaedic Surgery Physician avg: 324
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Tony Chien, D.O. filed 4,553 Medicare Part D claims in 2023 as a Orthopaedic Surgery Physician in Saint Louis, Missouri.
- 5K
- Part D claims, 2023
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.
Tony Chien, D.O.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
4,553 Top 7% higher than 93% of 1,370,886 prescribers
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
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Board-eligible specialty (heuristic, not verified)
Tony Chien, D.O. 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 Tony Chien, D.O.?
Quality data not reportedPrimary specialty
Orthopaedic Surgery Physician
Medicare Part D claims
4,553 14× vs specialty avg
Specialty distribution in Missouri
How Orthopaedic Surgery Physician compares to other specialties among Missouri 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 Orthopaedic Surgery 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).
Tony Chien, D.O. appears in the CMS NPPES registry as a Orthopaedic Surgery Physician provider holding D.O. credentials at 2821 N BALLAS RD STE C20, Saint Louis, MO, 63131, with a listed phone of (636) 778-9341. NPI 1477617025 was issued on 12/20/2006.
Medicare Part D records for calendar year 2023 show 4,553 prescription claims written by this provider, covering 305 Medicare beneficiaries and totaling roughly $110K in drug spend, with an opioid prescribing rate of 43.8%.
Orthopaedic Surgery Physician is a mid-sized specialty nationwide, with 25,775 enrolled providers across 56 states and an average of 324 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 | 1477617025 |
|---|---|
| Specialty | Orthopaedic Surgery Physician |
| Credentials | D.O. |
| Gender | Male |
| NPI Issued | 12/20/2006 |
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
4,553
Total Claims
$110K
Total Drug Cost
305
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 4,585
- Total Day Supply
- 102,848
- Generic Drug Cost
- $108K
- Opioid Claims
- 1,993 (43.8% rate)
- Antibiotic Claims
- 33
Patient Demographics
- Average Patient Age
- 63.5 years
- Avg HCC Risk Score
- 2.10
- Gender Split
- 55% female / 45% male
- Age Distribution
- <65: 158, 65-74: 93, 75-84: 43, 85+: 11
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Tony Chien, D.O. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Hydrocodone-Acetam…
Hydrocodone-Acetaminophen
1,335 claims
- Diclofenac Sodium
Diclofenac Sodium
702 claims
- Tizanidine Hcl
Tizanidine Hcl
586 claims
- Celecoxib 371
Celecoxib
371 claims
- Tramadol Hcl 251
Tramadol Hcl
251 claims
- Gabapentin 187
Gabapentin
187 claims
- Oxycodone Hcl 178
Oxycodone Hcl
178 claims
- Oxycodone-Acetamin… 160
Oxycodone-Acetaminophen
160 claims
| Drug | Claims |
|---|---|
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 1,335 |
| Diclofenac Sodium | 702 |
| Tizanidine Hcl | 586 |
| Celecoxib | 371 |
| Tramadol Hcl | 251 |
| Gabapentin | 187 |
| Oxycodone Hcl | 178 |
| Oxycodone-Acetaminophen Oxycodone Hcl/Acetaminophen | 160 |
| Ropinirole Hcl | 155 |
| Cyclobenzaprine Hcl | 104 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Orthopaedic Surgery Physician Overview
How Tony Chien, D.O. fits within the Orthopaedic Surgery Physician landscape nationally.
25,775
Orthopaedic Surgery Physician Providers in US
56
States with Orthopaedic Surgery Physician
324
Avg Claims per Provider
Tony Chien, D.O.'s 4,553 claims are above the specialty average of 324.
Nearby Orthopaedic Surgery Physician Providers in Missouri
Other clinicians with the same primary specialty enrolled in Missouri, drawn from the same CMS NPPES roster as Chien.
Dr. Dennis Abernathie
M.D.
Columbia, MO
Dr. Sameh Abolfotouh
MD
Columbia, MO
Dr. Moneer Abouljoud
MD
Saint Louis, MO
Dr. Mark Adams
M.D.
Columbia, MO
Dr. Ajay Aggarwal
M.D.
Columbia, MO
Compare Orthopaedic 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 Missouri medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Orthopaedic 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.
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Medical Specialties Explained
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Frequently Asked Questions
What is Tony Chien, D.O.'s specialty? ▼
Tony Chien, D.O. specializes in Orthopaedic Surgery Physician and practices in Saint Louis, Missouri. Credentials: D.O..
How much does Tony Chien, D.O. prescribe under Medicare Part D? ▼
In 2023, Tony Chien, D.O. wrote 4,553 Medicare Part D claims totaling $110K in drug costs for 305 beneficiaries.
Where is Tony Chien, D.O. located? ▼
Tony Chien, D.O. is located at 2821 N BALLAS RD STE C20, Saint Louis, MO, 63131. Phone: (636) 778-9341.
What is Tony Chien, D.O.'s NPI number? ▼
Tony Chien, D.O.'s National Provider Identifier (NPI) is 1477617025, issued on 12/20/2006.
Does Tony Chien, D.O. prescribe opioids? ▼
Yes, Tony Chien, D.O. had 1,993 opioid claims in 2023 with an opioid prescribing rate of 43.8%.
How many Orthopaedic Surgery Physician providers are there in the US? ▼
There are 25,775 Orthopaedic Surgery Physician providers across 56 states in the US. The average Orthopaedic Surgery Physician provider writes 324 Medicare Part D claims per year.
What drugs does Tony Chien, D.O. prescribe most often? ▼
Based on 2023 Medicare Part D data, Tony Chien, D.O.'s most frequently prescribed drugs include Hydrocodone-Acetaminophen, Diclofenac Sodium, Tizanidine Hcl. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Tony Chien, D.O. accept Medicare? ▼
Tony Chien, D.O. appears in CMS Medicare data with 4,553 Part D claims and 305 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Tony Chien, D.O.'s credentials? ▼
Tony Chien, D.O.'s NPI is 1477617025 with credentials D.O.. 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.
- 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.