Partial Hospitalization Services Integrity Act of 1999 - Amends title XVIII (Medicare) of the Social Security Act to provide for the following: (1) denial of Medicare coverage for partial hospitalization services (for psychiatric treatment) furnished in a skilled nursing facility, a residential treatment facility, or any other type of residential setting determined by the Secretary of Health and Human Services; (2) new qualifications for community mental health centers (centers) as the Secretary is required to specify to ensure the health and safety of individuals being furnished mental health services and their effective and efficient furnishing; and (3) national coverage and administrative policies for partial hospitalization services under Medicare that the Secretary is to first adopt using negotiated rulemaking.

Directs the Secretary to do the following: (1) provide for periodic recertification to ensure that the provision of such Medicare-reimbursable services by centers complies with applicable Medicare requirements; and (2) implement a specified demonstration project under Medicare part B (Supplementary Medical Insurance) under which centers may offer wrap around mental health services for purposes of providing for a full continuum of ambulatory behavioral health care services. Provides for funding for demonstration project costs.

Makes miscellaneous technical amendments concerning criteria for centers under the Public Health Service Act, and periodic physician review of physician written, individualized plans for partial hospitalization services under Medicare.

Amends SSA title XI to provide for civil monetary penalties for false certification of eligibility for hospice care or partial hospitalization services.