Exhibit 24
Power of Attorney

      Know all by these presents, that the undersigned hereby makes, constitutes
and appoints each of Jonathan H. Glenn and Christopher K. Logsdon, or any of
them signing singly, and with full power of substitution, the undersigned's true
and lawful attorney-in-fact to:

      (1) prepare, execute in the name of and on behalf of the undersigned, and
submit to the United States Securities and Exchange Commission (the "SEC") a
Form ID, including amendments thereto, and any other documents necessary or
appropriate to obtain codes and passwords enabling the undersigned to make
electronic filings with the SEC of reports required by Section 16(a) of the
Securities Exchange Act of 1934 or any rule or regulation of the SEC;

      (2) prepare, execute in the name and on behalf of the undersigned, in the
undersigned's capacity as an officer and/or director of MedAssets, Inc., a
Delaware corporation (the "Company"), Forms 3, 4, and 5 in accordance with
Section 16(a) of the Securities Exchange Act of 1934 and the rules thereunder;

      (3) do and perform any and all acts for and on behalf of the undersigned
which may be necessary or desirable to complete and execute any such Form 3, 4,
or 5, complete and execute any amendment of amendments thereto, and timely and
file such form with the SEC and any stock exchange or similar authority; and

      (4) take any and all other action of any type whatsoever in connection
with the foregoing which, in the opinion of such attorney-in-fact, may be of
benefit to, in the best interest of, or legally required by, the undersigned, it
being understood that the documents executed by such attorney-in-fact on behalf
of the undersigned pursuant to this Power of Attorney shall be in such form and
shall contain such terms and conditions as such attorney-in-fact may approve in
such attorney-in-fact's discretion.

      The undersigned hereby grants to each such attorney-in-fact full power and
authority to do and perform all and every act and thing whatsoever requisite,
necessary or proper to be done in the exercise of any of the rights and powers
herein granted, as fully to all intents and purposes as the undersigned night or
could do if present, with full power of substitution or revocation, hereby
ratifying and confirming all that such attorney-in-fact, or such
attorney-in-fact's substitute or substitutes, shall lawfully do or cause to be
done by virtue of this power of attorney and the rights and powers herein
granted.  The undersigned acknowledges that the foregoing attorneys-in-fact, in
serving in such capacity at the request of the undersigned, are not assuming,
nor is the Company assuming, any of the undersigned's responsibilities to comply
with Section 16 of the Securities Exchange Act of 1934 or the rules thereunder.

      This Power of Attorney shall remain in full force and effect until the
undersigned, after becoming subject to the requirements to file Forms 3, 4 and 5
with respect to the undersigned's holdings of and transactions in any equity
security or derivative security relating to the Company, whether or not issued
by the Company, ceases to be subject to those requirements, unless earlier
revoked by the undersigned in a signed writing delivered to such
attorney-in-fact.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of June 25, 2015.

By:

/s/ Kevin M. Twomey
-----------------------------------
Kevin M. Twomey

STATE OF Hamilton, Burmuda)
		       ):  ss.:
COUNTY OF       )

      On this 25th day of June, 2015, before me personally came Kevin Twomey, to
me known and who by me duly sworn did depose and say that such individual is
duly authorized to execute the foregoing Power of Attorney and that such
individual duly and properly signed their name thereto.

/s/ Christine E. Patton
-----------------------------------
Notary Public