An apparatus comprising: a patient identification resolution module comprising a digital processor configured to disambiguate patient ID for patient data having a time gap, the patient data including pre-gap patient data followed in time by the time gap, followed in time by post-gap patient data succeeding the time gap, wherein the time gap is a time interval during which patient data was not collected, wherein the patient ID resolution module is configured to (i) associate first patient ID information with the pre-gap patient data and (ii) associate second patient ID information with the post-gap patient data, the associations (i), (ii) being based on one or more timestamped patient ID entries (56, 58) associated with the patient data, the timestamp for each patient ID entry indicating a time when the patient ID information for the entry was entered, wherein the patient ID resolution module is further configured to associate the first patient ID information with the pre-gap patient data and the second patient ID information with the post-gap patient data by employing a set of patient ID disambiguation rules operating on: temporal positions of timestamps of the one or more timestamped patient ID entries (56, 58) and the time gap, and strength measures of the one or more timestamped patient ID entries (56, 58), the strength measures of each timestamped patient ID entry being selected based on a patient ID entry modality used to enter the timestamped patient ID entry. a patient identification resolution module comprising a digital processor configured to disambiguate patient ID for patient data having a time gap, the patient data including pre-gap patient data followed in time by the time gap, followed in time by post-gap patient data succeeding the time gap, wherein the time gap is a time interval during which patient data was not collected, wherein the patient ID resolution module is configured to (i) associate first patient ID information with the pre-gap patient data and (ii) associate second patient ID information with the post-gap patient data, the associations (i), (ii) being based on one or more timestamped patient ID entries (56, 58) associated with the patient data, the timestamp for each patient ID entry indicating a time when the patient ID information for the entry was entered, wherein the patient ID resolution module is further configured to associate the first patient ID information with the pre-gap patient data and the second patient ID information with the post-gap patient data by employing a set of patient ID disambiguation rules operating on: temporal positions of timestamps of the one or more timestamped patient ID entries (56, 58) and the time gap, and strength measures of the one or more timestamped patient ID entries (56, 58), the strength measures of each timestamped patient ID entry being selected based on a patient ID entry modality used to enter the timestamped patient ID entry. temporal positions of timestamps of the one or more timestamped patient ID entries (56, 58) and the time gap, and strength measures of the one or more timestamped patient ID entries (56, 58), the strength measures of each timestamped patient ID entry being selected based on a patient ID entry modality used to enter the timestamped patient ID entry.