DR. NELSON TAN CHAO M.D.
NPI 1619974896
Internal Medicine in Shelton, CT

Q: What is Nelson Chao's NPI number?

The NPI number for Nelson Chao is 1619974896. It was assigned to this individual provider in the NPPES registry on July 4, 2005.

Q: What is Nelson Chao's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Q: When was this NPI record last updated?

The NPPES record for Nelson Chao was last updated on April 24, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since July 04, 2005PECOS EnrolledAccepts Medicare AssignmentCLIA 07D2127823 · Waiver

81.18/100

CMS Quality Rating

4 CORPORATE DR, SUITE 268, SHELTON, CT 06484(203) 402-0377(203) 402-0772 Get Directions Write a Review

NPPES record last updated: April 24, 2024. Verified against the NPPES registry weekly; last sync: August 09, 2026.

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About Dr. Nelson Tan Chao M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. NELSON TAN CHAO M.D. (NPI 1619974896) is an individual internal medicine provider in Shelton, Connecticut, licensed in Connecticut (032857) and active in the NPI registry since July 2005. He is enrolled in Medicare PECOS, holds a CLIA Waiver certificate valid through March 19, 2027, and is a graduate of Other (1982).

NPPES Registry Identity

NPI1619974896

Entity TypeIndividualMale

Primary Taxonomy207R00000X

Provider Legal NameDR. NELSON TAN CHAOCredential: M.D.

Location Address4 CORPORATE DR, SUITE 268Shelton, CT 06484-6211

Mailing Address4 Corporate Dr, Suite 268Shelton, CT 06484-6211 · (203) 402-0377 · Fax (203) 402-0772

Phone(203) 402-0377

Fax(203) 402-0772

Sole ProprietorNo

Medical School CMSOtherGraduated 1982

Enumeration DateJuly 4, 2005

Last NPPES UpdateApril 24, 2024

NPPES CertifiedApril 24, 2024

✔ NPI 1619974896 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207R00000X

License✔ Licensed in CT · 032857

Definition

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

Also ListedAllergy & ImmunologyTaxonomy 207K00000X · License 032857 (CT)

Also ListedInternal Medicine · Pulmonary DiseaseTaxonomy 207RP1001X · License 032857 (CT)

4 CORPORATE DR, Shelton, CT 06484

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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Nelson Tan Chao M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID8628026358

PECOS Enrollment IDI20050110000056

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

CLIA Laboratory Certificates CMS CLIA

Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.

Certificate of Waiver 07D2127823

Nelson T Chao, MD · Shelton, CT

Active · expires Mar 19, 2027

CLIA Number07D2127823

Laboratory TypePhysician Office

Certificate Effective DateMarch 20, 2025

Certificate Expiration DateMarch 19, 2027

Laboratory DirectorNelson T. Chao

Laboratory Phone(203) 402-0377

Laboratory LocationNelson T Chao, MD4 Corporate Dr, Suite 268, Shelton, CT 06484

CLIA data matches this NPI record on: Address Phone

This certificate is issued to a laboratory to perform only waived tests.

Areas of Expertise CMS Part B claims 9

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

193 services85 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

185 services100 patients

Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit G0439

An annual wellness visit is a yearly appointment with your primary care provider to create or update a personalized prevention plan. This plan helps prevent illness based on your current health and risk factors. It's a subsequent visit, meaning it follows an initial assessment.

105 services105 patients

Stool analysis for blood to screen for colon tumors 82270

A stool analysis for blood is a non-invasive procedure used to check for the presence of hidden blood in your stool. This can be an early sign of colon tumors. The test involves collecting a small sample of stool at home and sending it to a lab for analysis.

68 services68 patients

Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report 93000

An electrocardiogram (ECG) is a non-invasive test that records your heart's electrical activity. Using 12 leads attached to your body, it captures data to help identify heart conditions. A doctor interprets the results and provides a report.

56 services53 patients

Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215

This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.

35 services22 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 06484 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$138.84 typical visit price

range $60.82 – $183.10

Typical copayment $34.71 (range $15.20 – $45.77)

Most-billed visit code 99204

Established Patient

$106.68 typical visit price

range $19.76 – $149.26

Typical copayment $26.67 (range $4.94 – $37.31)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

81.18/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Individually scored

Quality

70.72

Promoting Interoperability

100

Improvement Activities

Cost

66.56

Reported Quality Measures

Adult Sinusitis: Antibiotic Prescribed for Acute Viral Sinusitis (Overuse)

Lower rates are better for this measure.

48%99 patients3/55-star benchmark: 100%

Advance Care Plan

63%566 patients3/55-star benchmark: 100%

Colorectal Cancer Screening

62%1,045 patients3/55-star benchmark: 88%

Controlling High Blood Pressure

59%637 patients3/55-star benchmark: 91%

Diabetes: Eye Exam

0%130 patients1/55-star benchmark: 100%

Diabetes: Hemoglobin A1c (HbA1c) Poor Control (>9%)

Lower rates are better for this measure.

41%130 patients3/55-star benchmark: 91%

e-Prescribing

96%2,675 patients3/55-star benchmark: 100%

Preventive Care and Screening: Body Mass Index (BMI) Screening and Follow-Up Plan

38%1,727 patients2/55-star benchmark: 98%

Preventive Care and Screening: Screening for High Blood Pressure and Follow-Up Documented

33%1,772 patients3/55-star benchmark: 61%

Provide Patients Electronic Access to Their Health Information

80%1,151 patients4/55-star benchmark: 100%

Providers report different measures because they deliver different services; reporting more or less information is not a reflection of quality. Star ratings appear only where CMS assigned them.

Referred Medical Equipment & Supplies CMS DME claims 9

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Tubing with integrated heating element for use with positive airway pressure device A4604