NPI registry status
Active
2026 NPPES data Allergy & Immunology (Internal Medicine) Physician NPI 1942362777 M.D.
Verify on CMS → Kongsak Tanphaichitr, M.D.
Allergy & Immunology (Internal Medicine) Physician in Florissant, 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 517 in Allergy & Immunology (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
2K
Medicare Part D claims · 118 beneficiaries · Allergy & Immunology (Internal Medicine) Physician avg: 798
Generic prescribing
88%
generic claims · 11% brand-name · higher generic rates reduce patient out-of-pocket costs
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
Kongsak Tanphaichitr, M.D. filed 1,652 Medicare Part D claims in 2023 as a Allergy & Immunology (Internal Medicine) Physician in Florissant, Missouri, prescribing 88% generic.
- 2K
- Part D claims, 2023
- 88%
- generic prescribing
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.
Kongsak Tanphaichitr, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
1,652 Top 18% higher than 82% 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)
Kongsak Tanphaichitr, M.D. 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 Kongsak Tanphaichitr, M.D.?
Quality data not reportedPrimary specialty
Allergy & Immunology (Internal Medicine) Physician
Medicare Part D claims
1,652 107% vs specialty avg
Specialty distribution in Missouri
How Allergy & Immunology (Internal Medicine) 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 Allergy & Immunology (Internal Medicine) 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).
Kongsak Tanphaichitr, M.D. appears in the CMS NPPES registry as an Allergy & Immunology (Internal Medicine) Physician provider holding M.D. credentials at 11115 NEW HALLS FERRY RD, Florissant, MO, 63033, with a listed phone of (314) 839-4339. NPI 1942362777 was issued on 12/15/2006.
Medicare Part D records for calendar year 2023 show 1,652 prescription claims written by this provider, covering 118 Medicare beneficiaries and totaling roughly $371K in drug spend, split 11% brand-name and 88% generic by claim count, with an opioid prescribing rate of 6.8%.
Allergy & Immunology (Internal Medicine) Physician is a narrow specialty nationwide, with 517 enrolled providers across 47 states and an average of 798 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 | 1942362777 |
|---|---|
| Specialty | Allergy & Immunology (Internal Medicine) Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 12/15/2006 |
Brand vs generic prescribing mix · Typical
Kongsak Tanphaichitr, M.D. - brand share 11.0%
Allergy & Immunology (Internal Medicine) Physician average
11% brand-name claims vs 88% generic, on 1,652 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.
1,652
Total Claims
$371K
Total Drug Cost
118
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 3,101
- Total Day Supply
- 89,254
- Brand vs Generic
- 11% brand / 88% generic
- Brand Drug Cost
- $341K
- Generic Drug Cost
- $29K
- Opioid Claims
- 113 (6.8% rate)
- Antibiotic Claims
- 115
Patient Demographics
- Average Patient Age
- 72.4 years
- Avg HCC Risk Score
- 1.30
- Gender Split
- 64% female / 36% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Kongsak Tanphaichitr, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Methotrexate
Methotrexate
98 claims
- Hydroxychloroquine…
Hydroxychloroquine Sulfate
84 claims
- Alprazolam
Alprazolam
63 claims
- Triamterene-Hydroc…
Triamterene-Hydrochlorothiazid
63 claims
- Pravastatin Sodium
Pravastatin Sodium
59 claims
- Prednisone
Prednisone
49 claims
- Tramadol Hcl
Tramadol Hcl
48 claims
- Hydrocodone-Acetam…
Hydrocodone-Acetaminophen
44 claims
| Drug | Claims |
|---|---|
| Methotrexate Methotrexate Sodium | 98 |
| Hydroxychloroquine Sulfate | 84 |
| Alprazolam | 63 |
| Triamterene-Hydrochlorothiazid Triamterene/Hydrochlorothiazid | 63 |
| Pravastatin Sodium | 59 |
| Prednisone | 49 |
| Tramadol Hcl | 48 |
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 44 |
| Triamcinolone Acetonide | 44 |
| Levofloxacin | 43 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Allergy & Immunology (Internal Medicine) Physician in MO →
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Allergy & Immunology (Internal Medicine) Physician Overview
How Kongsak Tanphaichitr, M.D. fits within the Allergy & Immunology (Internal Medicine) Physician landscape nationally.
517
Allergy & Immunology (Internal Medicine) Physician Providers in US
47
States with Allergy & Immunology (Internal Medicine) Physician
798
Avg Claims per Provider
Kongsak Tanphaichitr, M.D.'s 1,652 claims are above the specialty average of 798.
Nearby Allergy & Immunology (Internal Medicine) Physician Providers in Missouri
Other clinicians with the same primary specialty enrolled in Missouri, drawn from the same CMS NPPES roster as Tanphaichitr.
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 Allergy & Immunology (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 Kongsak Tanphaichitr, M.D.'s specialty? ▼
Kongsak Tanphaichitr, M.D. specializes in Allergy & Immunology (Internal Medicine) Physician and practices in Florissant, Missouri. Credentials: M.D..
How much does Kongsak Tanphaichitr, M.D. prescribe under Medicare Part D? ▼
In 2023, Kongsak Tanphaichitr, M.D. wrote 1,652 Medicare Part D claims totaling $371K in drug costs for 118 beneficiaries.
Where is Kongsak Tanphaichitr, M.D. located? ▼
Kongsak Tanphaichitr, M.D. is located at 11115 NEW HALLS FERRY RD, Florissant, MO, 63033. Phone: (314) 839-4339.
What is Kongsak Tanphaichitr, M.D.'s NPI number? ▼
Kongsak Tanphaichitr, M.D.'s National Provider Identifier (NPI) is 1942362777, issued on 12/15/2006.
Does Kongsak Tanphaichitr, M.D. prescribe more brand-name or generic drugs? ▼
Kongsak Tanphaichitr, M.D.'s prescribing is 11% brand-name and 88% generic drugs by claim count, with $341K in brand drug costs.
Does Kongsak Tanphaichitr, M.D. prescribe opioids? ▼
Yes, Kongsak Tanphaichitr, M.D. had 113 opioid claims in 2023 with an opioid prescribing rate of 6.8%.
How many Allergy & Immunology (Internal Medicine) Physician providers are there in the US? ▼
There are 517 Allergy & Immunology (Internal Medicine) Physician providers across 47 states in the US. The average Allergy & Immunology (Internal Medicine) Physician provider writes 798 Medicare Part D claims per year.
What drugs does Kongsak Tanphaichitr, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Kongsak Tanphaichitr, M.D.'s most frequently prescribed drugs include Methotrexate, Hydroxychloroquine Sulfate, Alprazolam. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Kongsak Tanphaichitr, M.D. accept Medicare? ▼
Kongsak Tanphaichitr, M.D. appears in CMS Medicare data with 1,652 Part D claims and 118 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Kongsak Tanphaichitr, M.D.'s credentials? ▼
Kongsak Tanphaichitr, M.D.'s NPI is 1942362777 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 (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.
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.