Medi-Cal Rates: 
The file lists the maximum reimbursement rates payable by the Medi-Cal program for covered procedures described in the HCPCS and CPT-4 coding system.  
http://files.medi-cal.ca.gov/pubsdoco/rates/rateshome.asp

 DX Codes: 
This page provided by the Medicare Learning Network (Medlearn) provides tools to help providers and suppliers keep up to date with the latest educational information as it relates to ICD-9 Coding Services. 
http://www.cms.hhs.gov/medlearn/icd9code.asp
 
CPT Codes: 
This website is aimed at providing information to providers on Medicare's National CCI edits, but will not address specific CCI edits. 
http://www.cms.hhs.gov/NationalCorrectCodInitEd/ 

Alpha-Numeric HCPCS Files: 
These files contain the Level II alpha-numeric HCPCS procedure and modifier codes, their long and short descriptions, and applicable Medicare administrative, coverage, and pricing data. 
http://www.cms.hhs.gov/HCPCSReleaseCodeSets/

Zipcode To Carrier Locality File: 
This file is primarily intended for use by ambulance suppliers to map ZIP Codes to CMS carriers and localities. This file will also map Zip Codes to their State and can determine whether the ZIP Code has a rural designation as determined by CMS. 
http://www.cms.hhs.gov/prospmedicarefeesvcpmtgen
/01_overview.asp