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GARY MAASSEN M.D.
NPI 1831170968
Internal Medicine in Saint Louis, MO

Active since November 07, 2005
5034 GRIFFIN RD, SAINT LOUIS, MO 63128(314) 843-7333(314) 843-9946 Get Directions Write a Review

NPPES record last updated: September 24, 2012. Verified against the NPPES registry weekly; last sync: July 26, 2026.

About Gary Maassen M.d. NPPES

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

GARY MAASSEN M.D. (NPI 1831170968) is an individual internal medicine provider in Saint Louis, Missouri, licensed in Missouri (R7H60) and active in the NPI registry since November 2005.

NPPES Registry Identity

NPI1831170968
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameGARY MAASSENCredential: M.D.
Location Address5034 GRIFFIN RDSaint Louis, MO 63128-3418
Mailing AddressPo Box 23340Saint Louis, MO 63156-3340 · (314) 843-7333 · Fax (314) 843-9946
Phone(314) 843-7333
Fax(314) 843-9946
Sole ProprietorNo
Enumeration DateNovember 7, 2005
Last NPPES UpdateSeptember 24, 2012
✔ NPI 1831170968 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in MO · R7H60
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.
5034 GRIFFIN RD, Saint Louis, MO 63128
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Other Identifiers 12

Other26093MO · Bcbs
Other260293MO · Healthlink
Medicare PIN001012451MO
Other25688MO · Bcbs
OtherF92833MO · Mercy
Medicare UPINF92833MO
Medicare PIN110114101MO
Other127466MO · Ghp
Other127490MO · Ghp
Other4540903MO · Aetna
Other000000010024MO · Essence
Other0400519MO · Uhc

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.

Reported Quality Measures

Urinary Incontinence: Assessment of Presence or Absence of Urinary Incontinence in Women Aged 65 Years and Older
Percentage of female patients aged 65 years and older who were assessed for the presence or absence of urinary incontinence within 12 months
100%68 patients5/55-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.

Other Providers at the Same Location NPPES 13

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

CHRISTOPHER BRIAN ESPANA M.D.
Family Medicine
5034 GRIFFIN RD
SAINT LOUIS, MO 63128
St. Louis County (314) 843-7333
ROBERT M SAITZ M.D.
Internal Medicine
5034 GRIFFIN RD
SAINT LOUIS, MO 63128
St. Louis County (314) 843-7333
KATHLEEN CIZEK M.D.
Internal Medicine
5034 GRIFFIN RD
SAINT LOUIS, MO 63128
St. Louis County (314) 843-7333
JAMES EBEL M.D.
Internal Medicine
5034 GRIFFIN RD
SAINT LOUIS, MO 63128
St. Louis County (314) 843-7333
CURT E CALCATERRA M.D.
Internal Medicine
5034 GRIFFIN RD
SAINT LOUIS, MO 63128
St. Louis County (314) 843-7333
MARC O. MERBAUM M.D.
Internal Medicine
5034 GRIFFIN RD
SAINT LOUIS, MO 63128
St. Louis County (314) 843-7333
DR. CHRISTOPHER DAVID WEDELL M.D.
Family Medicine
5034 GRIFFIN RD
SAINT LOUIS, MO 63128
St. Louis County (314) 843-7333
ROBERT GEEKIE M.D.
Internal Medicine
5034 GRIFFIN RD
SAINT LOUIS, MO 63128
St. Louis County (314) 843-7333

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Gary Maassen's NPI number?

The NPI number for Gary Maassen is 1831170968. It was assigned to this individual provider in the NPPES registry on November 7, 2005.

Where is Gary Maassen located?

Gary Maassen practices at 5034 Griffin Rd, Saint Louis, MO 63128. The listed phone number is (314) 843-7333.

What is Gary Maassen's specialty?

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

When was this NPI record last updated?

The NPPES record for Gary Maassen was last updated on September 24, 2012. NPI Profile syncs with the weekly NPPES data releases published by CMS.