EL-1-004-3

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Measure Name	# of SSNs with duplicate MSIS IDs
File Type	ELG
Measure ID	EL-1-004-3
Measure Type	Count
Content area	ELG

Validation Type	Longitudinal and inferential

Measure Priority	N/A
Focus Area	N/A
Category	N/A

Claim Type	N/A
Adjustment Type	N/A
Crossover Type	N/A

Minimum	0
Maximum	500
TA Minimun
TA Maximum
Longitudinal Threshold	TBD
For TA (for including in compliance training)	No
For TA (Longitudinal)	No

DD Data Element	SSN • MSIS-IDENTIFICATION-NUM
DD Data Element Number	ELG036 • ELG033

Annotation	N/A
Specification	N/A

Published Date	Data Guide Version	DQM	Action	Field	Before	After
11/20/2025	4.0.22	EL-1-004-3	UPDATE	Annotation	Count the number of unique SSNs that have more than one unique MSIS ID.	N/A
11/20/2025	4.0.22	EL-1-004-3	UPDATE	Specification	STEP 1: Enrolled on the last day of DQ report monthDefine the eligible population from segment ENROLLMENT-TIME-SPAN-ELG00021 by keeping active records that satisfy the following criteria:1. ENROLLMENT-EFF-DATE <= last day of the DQ report month 2. ENROLLMENT-END-DATE >= last day of the DQ report month OR missing3. MSIS-IDENTIFICATION-NUM is not missingSTEP 2: Variable demographics on the last day of DQ report monthUsing the MSIS IDs that meet the criteria from STEP 1, join to segment VARIABLE-DEMOGRAPHICS-ELG00003 by keeping records that satisfy the following criteria:1a. VARIABLE-DEMOGRAPHIC-ELEMENT-EFF-DATE <= last day of the DQ report month2a. VARIABLE-DEMOGRAPHIC-ELEMENT-END-DATE >= last day of the DQ report month OR missingOR1b. VARIABLE-DEMOGRAPHIC-ELEMENT-EFF-DATE is missing2b. VARIABLE-DEMOGRAPHIC-ELEMENT-END-DATE is missingSTEP 3: SSN's with multiple MSIS IDsUse segment VARIABLE-DEMOGRAPHIC-ELG00003 and count unique SSN's associated with more than one MSIS-IDENTIFICATION-NUM	N/A
04/24/2025	4.0.7	EL-1-004-3	ADD	N/A		Created

EL-1-004-3

Key Information

Validation

Measure Priority

Claim Information

Thresholds

Data Elements