Justin Mao, MD

ActiveIndividual ProviderInternal Medicine
NPI issued: June 9, 2005

Quick Facts

NPI Number
1427052273
TypeIndividual
StatusActive
SpecialtyInternal Medicine
Taxonomy207R00000X — Internal Medicine
Phone
(630) 719-4799
StateIL

NPI Validation Status: Verified

✅Valid 10-digit NPI number (1427052273)
✅Active status confirmed
✅Verified by CMS NPPES Registry
✅HIPAA compliant identifier
✅Enumeration date on file (June 9, 2005)
Data source: CMS NPPES

Provider Overview

JUSTIN MAO, MD is a Internal Medicine provider based in Downers Grove, IL who has been registered with CMS since 2005. This NPI is currently Active under CMS NPPES registry.

Provider Details

NPI Number1427052273
Provider TypeIndividual Provider
GenderMale
CredentialMD
StatusActive
Enumeration DateJune 9, 2005

Practice Location

CityDowners Grove
StateIL
ZIP Code60515-1552
Phone(630) 719-4799

Specialties & Licenses

★ Primary
SpecialtyInternal Medicine
Taxonomy Code207R00000X
License StateIL

Mailing Address

CityDowners Grove
StateIL
ZIP Code60515-1552
Phone(630) 719-4799
Same as practice location

How to Use This NPI

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For Insurance Billing

Use NPI 1427052273 in Box 33 of the CMS-1500 claim form. This number is required by all major insurance carriers to identify the billing provider and process electronic medical claims.

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For Credentialing

Reference NPI 1427052273for provider credential verification. Hospital systems, state licensing boards, and CAQH directories query this number to verify the provider's active clinical status.

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For Patients

Share NPI 1427052273 with your insurance company. If you need to verify out-of-network benefits or file a reimbursement claim, your insurance provider will require this number to process it.

About Internal Medicine

Internal Medicine physicians (internists) specialize in the prevention, diagnosis, and nonsurgical treatment of adult illnesses, managing complex chronic conditions and multi-system diseases.

Browse all Internal Medicineproviders →
📊
213,549
Internal Medicine Providers in the US

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People Also Ask

What is Justin Mao's NPI number?
Justin Mao's NPI number is 1427052273, a unique 10-digit identifier issued by the Centers for Medicare & Medicaid Services (CMS).
Is Justin Mao's NPI currently active?
Yes, Justin Mao's NPI status is Active as of the latest CMS NPPES database updates.
What does Justin Mao specialize in?
Justin Mao specializes in Internal Medicine. The healthcare taxonomy code associated with this specialty is 207R00000X.
Where does Justin Mao practice?
Justin Mao practices in Downers Grove, IL 60515-1552.
When was Justin Mao's NPI issued?
Justin Mao's NPI was issued on June 9, 2005.
What is Justin Mao's provider type?
Justin Mao is registered as an Individual Provider under CMS NPI Type 1.