LIMITED POWER OF ATTORNEY FOR SECTION 16 REPORTING OBLIGATIONS

Know all by these presents, that the undersigned hereby makes, constitutes
and appoints Winifred L. Swan and Aras Lapinskas, each to act as the
undersigned's true and lawful attorney in fact with full power and authority
as hereinafter described to:

(1) execute for and on behalf of the undersigned, in the undersigned's
capacity as an officer and/or director of NxStage Medical, Inc. ("Company"),
Forms 3, 4, and 5 (including any amendments thereto) in accordance with
Section 16(a) of the Securities Exchange Act of 1934 and the rules
thereunder ("Exchange Act") and Form ID to obtain access codes to file
SEC forms on EDGAR;

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

(3) seek or obtain, as the undersigned's representative and on the
undersigned's behalf, information regarding transactions in the Company's
securities from any third party, including brokers, employee benefit plan
administrators and trustees, and the undersigned hereby authorizes any
such person to release any such information to such attorney in fact and
approves and ratifies any such release of information; and

(4) take any 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 any 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 might or could do if personally 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 relieving, nor is the
Company assuming nor relieving, any of the undersigned's responsibilities
to comply with Section 16 of the Exchange Act.  The undersigned
acknowledges that neither the Company nor the foregoing attorneys in fact
assume (1) any liability for the undersigned's responsibility to comply
with the requirement of the Exchange Act, (2) any liability of the
undersigned for any failure to comply with such requirements, or (3) any
obligation or liability of the undersigned for profit disgorgement under
Section 16(b) of the Exchange Act.

This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Forms 3, 4, and 5 with respect
to the undersigned's holdings of and transactions in securities issued
by the Company, unless earlier revoked by the undersigned in a signed
writing delivered to the foregoing attorneys in fact.

IN WITNESS WHEREOF, the undersigned has signed this Power of Attorney
as of July 18, 2016.

/s/ Heyward Doniganities issued
by the Company, unless earlier revoked by the undersigned in a signed
writing delivered to the foregoing attorneys in fact.

IN WITNESS WHEREOF, the undersigned has signed this Power of Attorney
as of July 18, 2016.

/s/ Heywar