2024 ICD-10-CM Procedure Code B51
Imaging, Veins, Fluoroscopy
- ICD-10-PCS Code:
- B51
- ICD-10-PCS Code for:
- Imaging, Veins, Fluoroscopy
- Is Billable?
- Not Valid for Submission
- Code Navigator:
B51 is a "header" nonspecific and non-billable procedure code used to indicate the performance of imaging, veins, fluoroscopy.
ICD-10-PCS Codes Adjacent to B51
- B50SYZZ - Plain Radiography of Bilateral Pulmonary Veins using Other Contrast
- B50T0ZZ - Plain Radiography of Portal and Splanchnic Veins using High Osmolar Contrast
- B50T1ZZ - Plain Radiography of Portal and Splanchnic Veins using Low Osmolar Contrast
- B50TYZZ - Plain Radiography of Portal and Splanchnic Veins using Other Contrast
- B50V0ZZ - Plain Radiography of Other Veins using High Osmolar Contrast
- B50V1ZZ - Plain Radiography of Other Veins using Low Osmolar Contrast
- B50VYZZ - Plain Radiography of Other Veins using Other Contrast
- B50W0ZZ - Plain Radiography of Dialysis Shunt/Fistula using High Osmolar Contrast
- B50W1ZZ - Plain Radiography of Dialysis Shunt/Fistula using Low Osmolar Contrast
- B50WYZZ - Plain Radiography of Dialysis Shunt/Fistula using Other Contrast
- B51 - Imaging, Veins, Fluoroscopy
- B5100ZA - Fluoroscopy of Epidural Veins using High Osmolar Contrast, Guidance
- B5100ZZ - Fluoroscopy of Epidural Veins using High Osmolar Contrast
- B5101ZA - Fluoroscopy of Epidural Veins using Low Osmolar Contrast, Guidance
- B5101ZZ - Fluoroscopy of Epidural Veins using Low Osmolar Contrast
- B510YZA - Fluoroscopy of Epidural Veins using Other Contrast, Guidance
- B510YZZ - Fluoroscopy of Epidural Veins using Other Contrast
- B510ZZA - Fluoroscopy of Epidural Veins, Guidance
- B510ZZZ - Fluoroscopy of Epidural Veins
- B5110ZA - Fluoroscopy of Cerebral and Cerebellar Veins using High Osmolar Contrast, Guidance
- B5110ZZ - Fluoroscopy of Cerebral and Cerebellar Veins using High Osmolar Contrast
B51 PCS Table
In an PCS table each code is represented by up seven alphanumeric characters, with each character in the table respresenting different aspects of the procedure. In the table provided below, each row represents an individual character and includes information about the character's position, designation, label, and procedure notes. For this PCS table the procedure code is in the imaging section and is part of the veins body system, classified under fluoroscopy operation.
Position | Designation | Character | Label | Procedures Notes |
---|---|---|---|---|
1 | Section | B | Imaging | |
2 | Body System | 5 | Veins | |
3 | Operation | 1 | Fluoroscopy | Involves: |
Other ICD-10-PCS Codes Used for Fluoroscopy
- B5100ZA Fluoroscopy of Epidural Veins using High Osmolar Contrast, Guidance
- B5100ZZ Fluoroscopy of Epidural Veins using High Osmolar Contrast
- B5101ZA Fluoroscopy of Epidural Veins using Low Osmolar Contrast, Guidance
- B5101ZZ Fluoroscopy of Epidural Veins using Low Osmolar Contrast
- B510YZA Fluoroscopy of Epidural Veins using Other Contrast, Guidance
- B510YZZ Fluoroscopy of Epidural Veins using Other Contrast
- B510ZZA Fluoroscopy of Epidural Veins, Guidance
- B510ZZZ Fluoroscopy of Epidural Veins
- B5110ZA Fluoroscopy of Cerebral and Cerebellar Veins using High Osmolar Contrast, Guidance
- B5110ZZ Fluoroscopy of Cerebral and Cerebellar Veins using High Osmolar Contrast
- B5111ZA Fluoroscopy of Cerebral and Cerebellar Veins using Low Osmolar Contrast, Guidance
- B5111ZZ Fluoroscopy of Cerebral and Cerebellar Veins using Low Osmolar Contrast
- B511YZA Fluoroscopy of Cerebral and Cerebellar Veins using Other Contrast, Guidance
- B511YZZ Fluoroscopy of Cerebral and Cerebellar Veins using Other Contrast
- B511ZZA Fluoroscopy of Cerebral and Cerebellar Veins, Guidance
- B511ZZZ Fluoroscopy of Cerebral and Cerebellar Veins
- B5120ZA Fluoroscopy of Intracranial Sinuses using High Osmolar Contrast, Guidance
- B5120ZZ Fluoroscopy of Intracranial Sinuses using High Osmolar Contrast
- B5121ZA Fluoroscopy of Intracranial Sinuses using Low Osmolar Contrast, Guidance
- B5121ZZ Fluoroscopy of Intracranial Sinuses using Low Osmolar Contrast
- B512YZA Fluoroscopy of Intracranial Sinuses using Other Contrast, Guidance
- B512YZZ Fluoroscopy of Intracranial Sinuses using Other Contrast
- B512ZZA Fluoroscopy of Intracranial Sinuses, Guidance
- B512ZZZ Fluoroscopy of Intracranial Sinuses
- B5130ZA Fluoroscopy of Right Jugular Veins using High Osmolar Contrast, Guidance
- B5130ZZ Fluoroscopy of Right Jugular Veins using High Osmolar Contrast
- B5131ZA Fluoroscopy of Right Jugular Veins using Low Osmolar Contrast, Guidance
- B5131ZZ Fluoroscopy of Right Jugular Veins using Low Osmolar Contrast
- B513YZA Fluoroscopy of Right Jugular Veins using Other Contrast, Guidance
- B513YZZ Fluoroscopy of Right Jugular Veins using Other Contrast
- B513ZZA Fluoroscopy of Right Jugular Veins, Guidance
- B513ZZZ Fluoroscopy of Right Jugular Veins
- B5140ZA Fluoroscopy of Left Jugular Veins using High Osmolar Contrast, Guidance
- B5140ZZ Fluoroscopy of Left Jugular Veins using High Osmolar Contrast
- B5141ZA Fluoroscopy of Left Jugular Veins using Low Osmolar Contrast, Guidance
- B5141ZZ Fluoroscopy of Left Jugular Veins using Low Osmolar Contrast
- B514YZA Fluoroscopy of Left Jugular Veins using Other Contrast, Guidance
- B514YZZ Fluoroscopy of Left Jugular Veins using Other Contrast
- B514ZZA Fluoroscopy of Left Jugular Veins, Guidance
- B514ZZZ Fluoroscopy of Left Jugular Veins
- B5150ZA Fluoroscopy of Bilateral Jugular Veins using High Osmolar Contrast, Guidance
- B5150ZZ Fluoroscopy of Bilateral Jugular Veins using High Osmolar Contrast
- B5151ZA Fluoroscopy of Bilateral Jugular Veins using Low Osmolar Contrast, Guidance
- B5151ZZ Fluoroscopy of Bilateral Jugular Veins using Low Osmolar Contrast
- B515YZA Fluoroscopy of Bilateral Jugular Veins using Other Contrast, Guidance
- B515YZZ Fluoroscopy of Bilateral Jugular Veins using Other Contrast
- B515ZZA Fluoroscopy of Bilateral Jugular Veins, Guidance
- B515ZZZ Fluoroscopy of Bilateral Jugular Veins
- B5160ZA Fluoroscopy of Right Subclavian Vein using High Osmolar Contrast, Guidance
- B5160ZZ Fluoroscopy of Right Subclavian Vein using High Osmolar Contrast
- B5161ZA Fluoroscopy of Right Subclavian Vein using Low Osmolar Contrast, Guidance
- B5161ZZ Fluoroscopy of Right Subclavian Vein using Low Osmolar Contrast
- B516YZA Fluoroscopy of Right Subclavian Vein using Other Contrast, Guidance
- B516YZZ Fluoroscopy of Right Subclavian Vein using Other Contrast
- B516ZZA Fluoroscopy of Right Subclavian Vein, Guidance
- B516ZZZ Fluoroscopy of Right Subclavian Vein
- B5170ZA Fluoroscopy of Left Subclavian Vein using High Osmolar Contrast, Guidance
- B5170ZZ Fluoroscopy of Left Subclavian Vein using High Osmolar Contrast
- B5171ZA Fluoroscopy of Left Subclavian Vein using Low Osmolar Contrast, Guidance
- B5171ZZ Fluoroscopy of Left Subclavian Vein using Low Osmolar Contrast
- B517YZA Fluoroscopy of Left Subclavian Vein using Other Contrast, Guidance
- B517YZZ Fluoroscopy of Left Subclavian Vein using Other Contrast
- B517ZZA Fluoroscopy of Left Subclavian Vein, Guidance
- B517ZZZ Fluoroscopy of Left Subclavian Vein
- B5180ZA Fluoroscopy of Superior Vena Cava using High Osmolar Contrast, Guidance
- B5180ZZ Fluoroscopy of Superior Vena Cava using High Osmolar Contrast
- B5181ZA Fluoroscopy of Superior Vena Cava using Low Osmolar Contrast, Guidance
- B5181ZZ Fluoroscopy of Superior Vena Cava using Low Osmolar Contrast
- B518YZA Fluoroscopy of Superior Vena Cava using Other Contrast, Guidance
- B518YZZ Fluoroscopy of Superior Vena Cava using Other Contrast
- B518ZZA Fluoroscopy of Superior Vena Cava, Guidance
- B518ZZZ Fluoroscopy of Superior Vena Cava
- B5190ZA Fluoroscopy of Inferior Vena Cava using High Osmolar Contrast, Guidance
- B5190ZZ Fluoroscopy of Inferior Vena Cava using High Osmolar Contrast
- B5191ZA Fluoroscopy of Inferior Vena Cava using Low Osmolar Contrast, Guidance
- B5191ZZ Fluoroscopy of Inferior Vena Cava using Low Osmolar Contrast
- B519YZA Fluoroscopy of Inferior Vena Cava using Other Contrast, Guidance
- B519YZZ Fluoroscopy of Inferior Vena Cava using Other Contrast
- B519ZZA Fluoroscopy of Inferior Vena Cava, Guidance
- B519ZZZ Fluoroscopy of Inferior Vena Cava
- B51B0ZA Fluoroscopy of Right Lower Extremity Veins using High Osmolar Contrast, Guidance
- B51B0ZZ Fluoroscopy of Right Lower Extremity Veins using High Osmolar Contrast
- B51B1ZA Fluoroscopy of Right Lower Extremity Veins using Low Osmolar Contrast, Guidance
- B51B1ZZ Fluoroscopy of Right Lower Extremity Veins using Low Osmolar Contrast
- B51BYZA Fluoroscopy of Right Lower Extremity Veins using Other Contrast, Guidance
- B51BYZZ Fluoroscopy of Right Lower Extremity Veins using Other Contrast
- B51BZZA Fluoroscopy of Right Lower Extremity Veins, Guidance
- B51BZZZ Fluoroscopy of Right Lower Extremity Veins
- B51C0ZA Fluoroscopy of Left Lower Extremity Veins using High Osmolar Contrast, Guidance
- B51C0ZZ Fluoroscopy of Left Lower Extremity Veins using High Osmolar Contrast
- B51C1ZA Fluoroscopy of Left Lower Extremity Veins using Low Osmolar Contrast, Guidance
- B51C1ZZ Fluoroscopy of Left Lower Extremity Veins using Low Osmolar Contrast
- B51CYZA Fluoroscopy of Left Lower Extremity Veins using Other Contrast, Guidance
- B51CYZZ Fluoroscopy of Left Lower Extremity Veins using Other Contrast
- B51CZZA Fluoroscopy of Left Lower Extremity Veins, Guidance
- B51CZZZ Fluoroscopy of Left Lower Extremity Veins
- B51D0ZA Fluoroscopy of Bilateral Lower Extremity Veins using High Osmolar Contrast, Guidance
- B51D0ZZ Fluoroscopy of Bilateral Lower Extremity Veins using High Osmolar Contrast
- B51D1ZA Fluoroscopy of Bilateral Lower Extremity Veins using Low Osmolar Contrast, Guidance
- B51D1ZZ Fluoroscopy of Bilateral Lower Extremity Veins using Low Osmolar Contrast
- B51DYZA Fluoroscopy of Bilateral Lower Extremity Veins using Other Contrast, Guidance
- B51DYZZ Fluoroscopy of Bilateral Lower Extremity Veins using Other Contrast
- B51DZZA Fluoroscopy of Bilateral Lower Extremity Veins, Guidance
- B51DZZZ Fluoroscopy of Bilateral Lower Extremity Veins
- B51F0ZA Fluoroscopy of Right Pelvic (Iliac) Veins using High Osmolar Contrast, Guidance
- B51F0ZZ Fluoroscopy of Right Pelvic (Iliac) Veins using High Osmolar Contrast
- B51F1ZA Fluoroscopy of Right Pelvic (Iliac) Veins using Low Osmolar Contrast, Guidance
- B51F1ZZ Fluoroscopy of Right Pelvic (Iliac) Veins using Low Osmolar Contrast
- B51FYZA Fluoroscopy of Right Pelvic (Iliac) Veins using Other Contrast, Guidance
- B51FYZZ Fluoroscopy of Right Pelvic (Iliac) Veins using Other Contrast
- B51FZZA Fluoroscopy of Right Pelvic (Iliac) Veins, Guidance
- B51FZZZ Fluoroscopy of Right Pelvic (Iliac) Veins
- B51G0ZA Fluoroscopy of Left Pelvic (Iliac) Veins using High Osmolar Contrast, Guidance
- B51G0ZZ Fluoroscopy of Left Pelvic (Iliac) Veins using High Osmolar Contrast
- B51G1ZA Fluoroscopy of Left Pelvic (Iliac) Veins using Low Osmolar Contrast, Guidance
- B51G1ZZ Fluoroscopy of Left Pelvic (Iliac) Veins using Low Osmolar Contrast
- B51GYZA Fluoroscopy of Left Pelvic (Iliac) Veins using Other Contrast, Guidance
- B51GYZZ Fluoroscopy of Left Pelvic (Iliac) Veins using Other Contrast
- B51GZZA Fluoroscopy of Left Pelvic (Iliac) Veins, Guidance
- B51GZZZ Fluoroscopy of Left Pelvic (Iliac) Veins
- B51H0ZA Fluoroscopy of Bilateral Pelvic (Iliac) Veins using High Osmolar Contrast, Guidance
- B51H0ZZ Fluoroscopy of Bilateral Pelvic (Iliac) Veins using High Osmolar Contrast
- B51H1ZA Fluoroscopy of Bilateral Pelvic (Iliac) Veins using Low Osmolar Contrast, Guidance
- B51H1ZZ Fluoroscopy of Bilateral Pelvic (Iliac) Veins using Low Osmolar Contrast
- B51HYZA Fluoroscopy of Bilateral Pelvic (Iliac) Veins using Other Contrast, Guidance
- B51HYZZ Fluoroscopy of Bilateral Pelvic (Iliac) Veins using Other Contrast
- B51HZZA Fluoroscopy of Bilateral Pelvic (Iliac) Veins, Guidance
- B51HZZZ Fluoroscopy of Bilateral Pelvic (Iliac) Veins
- B51J0ZA Fluoroscopy of Right Renal Vein using High Osmolar Contrast, Guidance
- B51J0ZZ Fluoroscopy of Right Renal Vein using High Osmolar Contrast
- B51J1ZA Fluoroscopy of Right Renal Vein using Low Osmolar Contrast, Guidance
- B51J1ZZ Fluoroscopy of Right Renal Vein using Low Osmolar Contrast
- B51JYZA Fluoroscopy of Right Renal Vein using Other Contrast, Guidance
- B51JYZZ Fluoroscopy of Right Renal Vein using Other Contrast
- B51JZZA Fluoroscopy of Right Renal Vein, Guidance
- B51JZZZ Fluoroscopy of Right Renal Vein
- B51K0ZA Fluoroscopy of Left Renal Vein using High Osmolar Contrast, Guidance
- B51K0ZZ Fluoroscopy of Left Renal Vein using High Osmolar Contrast
- B51K1ZA Fluoroscopy of Left Renal Vein using Low Osmolar Contrast, Guidance
- B51K1ZZ Fluoroscopy of Left Renal Vein using Low Osmolar Contrast
- B51KYZA Fluoroscopy of Left Renal Vein using Other Contrast, Guidance
- B51KYZZ Fluoroscopy of Left Renal Vein using Other Contrast
- B51KZZA Fluoroscopy of Left Renal Vein, Guidance
- B51KZZZ Fluoroscopy of Left Renal Vein
- B51L0ZA Fluoroscopy of Bilateral Renal Veins using High Osmolar Contrast, Guidance
- B51L0ZZ Fluoroscopy of Bilateral Renal Veins using High Osmolar Contrast
- B51L1ZA Fluoroscopy of Bilateral Renal Veins using Low Osmolar Contrast, Guidance
- B51L1ZZ Fluoroscopy of Bilateral Renal Veins using Low Osmolar Contrast
- B51LYZA Fluoroscopy of Bilateral Renal Veins using Other Contrast, Guidance
- B51LYZZ Fluoroscopy of Bilateral Renal Veins using Other Contrast
- B51LZZA Fluoroscopy of Bilateral Renal Veins, Guidance
- B51LZZZ Fluoroscopy of Bilateral Renal Veins
- B51M0ZA Fluoroscopy of Right Upper Extremity Veins using High Osmolar Contrast, Guidance
- B51M0ZZ Fluoroscopy of Right Upper Extremity Veins using High Osmolar Contrast
- B51M1ZA Fluoroscopy of Right Upper Extremity Veins using Low Osmolar Contrast, Guidance
- B51M1ZZ Fluoroscopy of Right Upper Extremity Veins using Low Osmolar Contrast
- B51MYZA Fluoroscopy of Right Upper Extremity Veins using Other Contrast, Guidance
- B51MYZZ Fluoroscopy of Right Upper Extremity Veins using Other Contrast
- B51MZZA Fluoroscopy of Right Upper Extremity Veins, Guidance
- B51MZZZ Fluoroscopy of Right Upper Extremity Veins
- B51N0ZA Fluoroscopy of Left Upper Extremity Veins using High Osmolar Contrast, Guidance
- B51N0ZZ Fluoroscopy of Left Upper Extremity Veins using High Osmolar Contrast
- B51N1ZA Fluoroscopy of Left Upper Extremity Veins using Low Osmolar Contrast, Guidance
- B51N1ZZ Fluoroscopy of Left Upper Extremity Veins using Low Osmolar Contrast
- B51NYZA Fluoroscopy of Left Upper Extremity Veins using Other Contrast, Guidance
- B51NYZZ Fluoroscopy of Left Upper Extremity Veins using Other Contrast
- B51NZZA Fluoroscopy of Left Upper Extremity Veins, Guidance
- B51NZZZ Fluoroscopy of Left Upper Extremity Veins
- B51P0ZA Fluoroscopy of Bilateral Upper Extremity Veins using High Osmolar Contrast, Guidance
- B51P0ZZ Fluoroscopy of Bilateral Upper Extremity Veins using High Osmolar Contrast
- B51P1ZA Fluoroscopy of Bilateral Upper Extremity Veins using Low Osmolar Contrast, Guidance
- B51P1ZZ Fluoroscopy of Bilateral Upper Extremity Veins using Low Osmolar Contrast
- B51PYZA Fluoroscopy of Bilateral Upper Extremity Veins using Other Contrast, Guidance
- B51PYZZ Fluoroscopy of Bilateral Upper Extremity Veins using Other Contrast
- B51PZZA Fluoroscopy of Bilateral Upper Extremity Veins, Guidance
- B51PZZZ Fluoroscopy of Bilateral Upper Extremity Veins
- B51Q0ZA Fluoroscopy of Right Pulmonary Vein using High Osmolar Contrast, Guidance
- B51Q0ZZ Fluoroscopy of Right Pulmonary Vein using High Osmolar Contrast
- B51Q1ZA Fluoroscopy of Right Pulmonary Vein using Low Osmolar Contrast, Guidance
- B51Q1ZZ Fluoroscopy of Right Pulmonary Vein using Low Osmolar Contrast
- B51QYZA Fluoroscopy of Right Pulmonary Vein using Other Contrast, Guidance
- B51QYZZ Fluoroscopy of Right Pulmonary Vein using Other Contrast
- B51QZZA Fluoroscopy of Right Pulmonary Vein, Guidance
- B51QZZZ Fluoroscopy of Right Pulmonary Vein
- B51R0ZA Fluoroscopy of Left Pulmonary Vein using High Osmolar Contrast, Guidance
- B51R0ZZ Fluoroscopy of Left Pulmonary Vein using High Osmolar Contrast
- B51R1ZA Fluoroscopy of Left Pulmonary Vein using Low Osmolar Contrast, Guidance
- B51R1ZZ Fluoroscopy of Left Pulmonary Vein using Low Osmolar Contrast
- B51RYZA Fluoroscopy of Left Pulmonary Vein using Other Contrast, Guidance
- B51RYZZ Fluoroscopy of Left Pulmonary Vein using Other Contrast
- B51RZZA Fluoroscopy of Left Pulmonary Vein, Guidance
- B51RZZZ Fluoroscopy of Left Pulmonary Vein
- B51S0ZA Fluoroscopy of Bilateral Pulmonary Veins using High Osmolar Contrast, Guidance
- B51S0ZZ Fluoroscopy of Bilateral Pulmonary Veins using High Osmolar Contrast
- B51S1ZA Fluoroscopy of Bilateral Pulmonary Veins using Low Osmolar Contrast, Guidance
- B51S1ZZ Fluoroscopy of Bilateral Pulmonary Veins using Low Osmolar Contrast
- B51SYZA Fluoroscopy of Bilateral Pulmonary Veins using Other Contrast, Guidance
- B51SYZZ Fluoroscopy of Bilateral Pulmonary Veins using Other Contrast
- B51SZZA Fluoroscopy of Bilateral Pulmonary Veins, Guidance
- B51SZZZ Fluoroscopy of Bilateral Pulmonary Veins
- B51T0ZA Fluoroscopy of Portal and Splanchnic Veins using High Osmolar Contrast, Guidance
- B51T0ZZ Fluoroscopy of Portal and Splanchnic Veins using High Osmolar Contrast
- B51T1ZA Fluoroscopy of Portal and Splanchnic Veins using Low Osmolar Contrast, Guidance
- B51T1ZZ Fluoroscopy of Portal and Splanchnic Veins using Low Osmolar Contrast
- B51TYZA Fluoroscopy of Portal and Splanchnic Veins using Other Contrast, Guidance
- B51TYZZ Fluoroscopy of Portal and Splanchnic Veins using Other Contrast
- B51TZZA Fluoroscopy of Portal and Splanchnic Veins, Guidance
- B51TZZZ Fluoroscopy of Portal and Splanchnic Veins
- B51V0ZA Fluoroscopy of Other Veins using High Osmolar Contrast, Guidance
- B51V0ZZ Fluoroscopy of Other Veins using High Osmolar Contrast
- B51V1ZA Fluoroscopy of Other Veins using Low Osmolar Contrast, Guidance
- B51V1ZZ Fluoroscopy of Other Veins using Low Osmolar Contrast
- B51VYZA Fluoroscopy of Other Veins using Other Contrast, Guidance
- B51VYZZ Fluoroscopy of Other Veins using Other Contrast
- B51VZZA Fluoroscopy of Other Veins, Guidance
- B51VZZZ Fluoroscopy of Other Veins
- B51W0ZA Fluoroscopy of Dialysis Shunt/Fistula using High Osmolar Contrast, Guidance
- B51W0ZZ Fluoroscopy of Dialysis Shunt/Fistula using High Osmolar Contrast
- B51W1ZA Fluoroscopy of Dialysis Shunt/Fistula using Low Osmolar Contrast, Guidance
- B51W1ZZ Fluoroscopy of Dialysis Shunt/Fistula using Low Osmolar Contrast
- B51WYZA Fluoroscopy of Dialysis Shunt/Fistula using Other Contrast, Guidance
- B51WYZZ Fluoroscopy of Dialysis Shunt/Fistula using Other Contrast
- B51WZZA Fluoroscopy of Dialysis Shunt/Fistula, Guidance
- B51WZZZ Fluoroscopy of Dialysis Shunt/Fistula
What is ICD-10-PCS?
The ICD-10 Procedure Coding System (ICD-10-PCS) is a catalog of procedural codes used by medical professionals for hospital inpatient healthcare settings. The Centers for Medicare and Medicaid Services (CMS) maintain the catalog in the U.S. releasing yearly updates. The 2024 ICD-10-PCS codes are to be used for discharges occurring from October 1, 2023 through September 30, 2024.
Each ICD-10-PCS code has a structure of seven alphanumeric characters and contains no decimals. The first character defines the major "section". Depending on the "section" the second through seventh characters mean different things.