Pi Mu, ΠM, was founded on December 13, 1892 at the University of Virginia

University of Virginia

The University of Virginia is a public research university located in Charlottesville, Virginia, United States, founded by Thomas Jefferson...

 by John W. Mallet, Hugh I. Cummings, Powell C. Fauntleroy, Hugh T. McGuire, E. L. Hobson, Nicholas Wothington, Rawley Penick, Charles E. Marrow, James S. Irving, Rawley Martin and Hugh H. Duke. Dr. Mallet designed the name and motto.

In November, 1921, Dave F. Dozier, Pi Delta Phi '26, of Phi Chi Medical Fraternity and J. P. Williams of Pi Mu jointly instituted unofficial negotiations for a merger of Pi Mu and Phi Chi. This conference culminated in an agreement of merger signed October 7, 1922, in Richmond, Virginia, by Albert F. Saunders for Phi Chi and J. Blair Fitts for Pi Mu. Also participating in the arrangements of merger were Dave F. Dozier, Pi Delta Phi, and William I. Owens, Theta Eta, for Phi Chi and J. P. Williams of Pi Mu. Under the arrangements of merger, the Beta and Gamma of Pi Mu members were initiated into Theta Eta of Phi Chi and Alpha of Pi Mu was installed as Pi Mu (Chapter) of Phi Chi, October 14, 1922. The alumni of Pi Mu became associate members of Pi Mu of Phi Chi: they were obligated to become life subscribers to the Phi Chi QUARTERLY and membership cards of Phi Chi were issued to those who so subscribed; the associate members were granted the right to wear the badge of Phi Chi although the Pi Mu official badge was to remain "official" for all Pi Mu alumni graduating prier to July l, 1922. The Pi Mu badge was a Greek cross with skull and bones at the center. The skull was set with emerald eyes and the letters "ΠM" displayed on the horizontal arm of the cross.

Through this amalgamation Phi Chi received from Pi Mu all her interests and was free to accept any part of the ritual and constitution. Phi Chi also agreed to sponsor the Pi Mu honor system. Through this merger Phi Chi attained a chapter roll of 51 and a membership of 12,180.

The ΠΜ fraternity consisted of the following chapters before merging with ΦΧ:

Chapter	Location	Dates
A	University of Virginia University of Virginia The University of Virginia is a public research university located in Charlottesville, Virginia, United States, founded by Thomas Jefferson...	1892–1904; 1908-1922	Became ΠM of Phi Chi Phi Chi Phi Chi is one of the oldest and largest international medical fraternities of its kind in the world. Phi Chi evolved from the merging of two professional medical fraternities bearing the same name. Phi Chi Society was founded on March 31, 1889, at the University of Vermont, Burlington, Vt...
B	Medical College of Virginia	1893–1896	Joined BΓ in 1896
Γ	University College of Medicine	1896	Joined BΓ in 1896
BΓ	University College of Medicine	1896–1922	Joined ΘH of Phi Chi Phi Chi Phi Chi is one of the oldest and largest international medical fraternities of its kind in the world. Phi Chi evolved from the merging of two professional medical fraternities bearing the same name. Phi Chi Society was founded on March 31, 1889, at the University of Vermont, Burlington, Vt...
Δ	Louisville Medical College	1904-1907	Joined ΔH in 1907
E	University of Louisville University of Louisville The University of Louisville is a public university in Louisville, Kentucky. When founded in 1798, it was the first city-owned public university in the United States and one of the first universities chartered west of the Allegheny Mountains. The university is mandated by the Kentucky General...	1904-1907	Joined EZ in 1907
Z	University of Kentucky University of Kentucky The University of Kentucky, also known as UK, is a public co-educational university and is one of the state's two land-grant universities, located in Lexington, Kentucky...	1905-1907	Joined EZ in 1907
H	Hospital College of Louisville	1907	Joined ΔH in 1907
ΔH	Louisville Medical College	1907-1908	Joined ΔE in 1908
EZ	University of Louisville University of Louisville The University of Louisville is a public university in Louisville, Kentucky. When founded in 1798, it was the first city-owned public university in the United States and one of the first universities chartered west of the Allegheny Mountains. The university is mandated by the Kentucky General...	1907-1908	Joined ΔE in 1908
ΔE	University of Louisville University of Louisville The University of Louisville is a public university in Louisville, Kentucky. When founded in 1798, it was the first city-owned public university in the United States and one of the first universities chartered west of the Allegheny Mountains. The university is mandated by the Kentucky General...	1908–1922	Joined AA of Phi Chi Phi Chi Phi Chi is one of the oldest and largest international medical fraternities of its kind in the world. Phi Chi evolved from the merging of two professional medical fraternities bearing the same name. Phi Chi Society was founded on March 31, 1889, at the University of Vermont, Burlington, Vt...
Θ	Jefferson Medical College	1908–1915
I	Medical College of South Carolina	1908–1914
K	University of Tennessee University of Tennessee The University of Tennessee is a public land-grant university headquartered at Knoxville, Tennessee, United States...	1908–1922	Joined AB of Phi Chi Phi Chi Phi Chi is one of the oldest and largest international medical fraternities of its kind in the world. Phi Chi evolved from the merging of two professional medical fraternities bearing the same name. Phi Chi Society was founded on March 31, 1889, at the University of Vermont, Burlington, Vt...
Λ	Vanderbilt University Vanderbilt University Vanderbilt University is a private research university located in Nashville, Tennessee, United States. Founded in 1873, the university is named for shipping and rail magnate "Commodore" Cornelius Vanderbilt, who provided Vanderbilt its initial $1 million endowment despite having never been to the...	1910–1922	Joined Π of Phi Chi Phi Chi Phi Chi is one of the oldest and largest international medical fraternities of its kind in the world. Phi Chi evolved from the merging of two professional medical fraternities bearing the same name. Phi Chi Society was founded on March 31, 1889, at the University of Vermont, Burlington, Vt...
M	Johns Hopkins University Johns Hopkins University The Johns Hopkins University, commonly referred to as Johns Hopkins, JHU, or simply Hopkins, is a private research university based in Baltimore, Maryland, United States...	1910–1922	Joined ΚΔ of Phi Chi Phi Chi Phi Chi is one of the oldest and largest international medical fraternities of its kind in the world. Phi Chi evolved from the merging of two professional medical fraternities bearing the same name. Phi Chi Society was founded on March 31, 1889, at the University of Vermont, Burlington, Vt...
N	Columbia University Columbia University Columbia University in the City of New York is a private, Ivy League university in Manhattan, New York City. Columbia is the oldest institution of higher learning in the state of New York, the fifth oldest in the United States, and one of the country's nine Colonial Colleges founded before the...	1913–1922	Joined ΥΣ of Phi Chi Phi Chi Phi Chi is one of the oldest and largest international medical fraternities of its kind in the world. Phi Chi evolved from the merging of two professional medical fraternities bearing the same name. Phi Chi Society was founded on March 31, 1889, at the University of Vermont, Burlington, Vt...

The Journal- annual publication begun in 1908

The crest of Pi Mu: a caduceus

Caduceus

The caduceus is the staff carried by Hermes in Greek mythology. The same staff was also borne by heralds in general, for example by Iris, the messenger of Hera. It is a short staff entwined by two serpents, sometimes surmounted by wings...

at the top of a shield with the Latin phrase "Semper Ad Honorem." and the Greek letters beneath.

The design of the Phi Chi pledge button was changed at the time of the Pi Mu merger in 1922 to honor the Pi Mu honor system. The badge of Pi Mu, a Greek cross carrying the skull and crossbones in addition to the Greek letters ΠΜ, by agreement became Phi Chi's pledge button with the substitution of a caduceus and the letters ΦΧ in silver on a field of green.