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HIPAA: ASC X12N Version 4010A1 Companion Guides and NCPDP Technical Specifications

The ASC X12N Version 4010A1 Companion Guides define Medi-Cal’s adoption of electronic transaction standards mandated by HIPAA. The Companion Guides supplement the full Implementation Guides and their corresponding Addenda, which can be obtained from the Washington Publishing Company Web site.

Companion Guides exist for the following transactions:

The National Council for Prescription Drug Programs (NCPDP) Telecommunication Standard, Version 5.1 Technical Specifications for pharmacy claims, including compound segment, are available in the document Medi-Cal POS NCPDP Pharmacy Transaction Specifications, Third Party Vendors (Dial-Up and Leased-Line) (1042 KB - updated July 31, 2008).

In addition, Draft NCPDP 5.1 Prior Authorization Network Specifications (304 KB) are now available. These specifications are for NCPDP 5.1 prior authorization transactions. In this draft specifications document, a shaded field indicates an optional field. If an entire segment is optional, this is noted in the text preceding the segment's specifications rather than by shading the entire segment.

NCPDP Prior Authorization transactions have been implemented into production as of March 2005. The above draft NCPDP 5.1 Prior Authorization Network Specifications has been integrated into the existing Medi-Cal POS NCPDP Pharmacy Transaction Specifications, Third Party Vendors (Dial-Up and Leased-Line) (1042 KB - updated July 31, 2008) document. Refer to the Medi-Cal POS Network Telecommunications Interface Standards, Third Party Vendors (Draft) document for more information about NCPDP transaction formatting.

Providers can review or download individual sections of each Companion Guide, or download an entire guide as a single Zip file. The NCPDP Technical Specifications are offered only as a downloadable Zip file. Change logs are included in the guides to identify and describe ongoing modifications. For more information about HIPAA or the Companion Guides, call the TSC at 1-800-541-5555 (out-of-state providers and software vendors should call [916] 636-1200).

The documents available on this page are updated on an ongoing basis to ensure that they contain the most up-to-date information. Providers and submitters are therefore encouraged to and refer to it often for the most current documents.


270/271 Version 4010A1 Health Care Eligibility Benefit Inquiry and Response Companion Guide (Real-Time and Batch Transactions)

Download the 270/271 Companion Guide as a single Zip file (1.46 MB), or view/download individual sections using the links below.

Overview (updated May 15, 2007) Data Specifications Supplemental Documents

276/277 Version 4010A1 Health Care Claim Status Request and Response Companion Guides (Batch Transactions)

Download the 276/277 Companion Guides as a single Zip file (176 KB), or view/download individual guides using the links below.


835 Version 4010A1 Health Care Claim Advice/Payment Companion Guide

Download the 835 Companion Guide as a single Zip file (192 KB), or view/download individual sections using the links below.

835 ASC X12 v.4010A1 Control Specifications

837 Version 4010A1 Health Care Claim Companion Guide

Download the 837 Companion Guide as a single Zip file (1.36 MB), or view/download individual sections using the links below.

Submission and Billing Instructions
Data Specifications ANSI ASC X12N 837 v.4010A1 Institutional Specifications ANSI ASC X12N 837 v.4010A1 Professional Specifications Supplemental Documents



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