diff --git a/py/desispec/coaddition.py b/py/desispec/coaddition.py
index 02d355aa5..260253c2e 100644
--- a/py/desispec/coaddition.py
+++ b/py/desispec/coaddition.py
@@ -395,6 +395,16 @@ def coadd_fibermap(fibermap, onetile=False):
             if k in fibermap.colnames :
                 tfmap[k][i]=1./np.mean(1./fibermap[k][jj][compute_coadds])
 
+        #- Targeting bits can evolve, so use bitwise OR of any input bits set
+        #- See Sec 5.1 of https://ui.adsabs.harvard.edu/abs/2023AJ....165...50M/abstract
+        for targetcol in ('CMX_TARGET',
+                          'SV1_DESI_TARGET', 'SV1_BGS_TARGET', 'SV1_MWS_TARGET', 'SV1_SCND_TARGET',
+                          'SV2_DESI_TARGET', 'SV2_BGS_TARGET', 'SV2_MWS_TARGET', 'SV2_SCND_TARGET',
+                          'SV3_DESI_TARGET', 'SV3_BGS_TARGET', 'SV3_MWS_TARGET', 'SV3_SCND_TARGET',
+                          'DESI_TARGET', 'BGS_TARGET', 'MWS_TARGET', 'SCND_TARGET'):
+            if targetcol in tfmap.colnames:
+                tfmap[targetcol][i] = np.bitwise_or.reduce(fibermap[targetcol][jj],axis=0)
+
     #- Remove some columns that apply to individual exp but not coadds
     #- (even coadds of the same tile)
     for k in ['NIGHT', 'EXPID', 'MJD', 'EXPTIME', 'NUM_ITER',
diff --git a/py/desispec/test/test_coadd.py b/py/desispec/test/test_coadd.py
index 89d0041d9..f0dbce220 100644
--- a/py/desispec/test/test_coadd.py
+++ b/py/desispec/test/test_coadd.py
@@ -510,6 +510,55 @@ def test_coadd_fibermap_mjd_night(self):
         self.assertEqual(cofm['MEAN_MJD'][1],  np.mean(fm['MJD'][2:]))
 
 
+    def test_coadd_targetmask(self):
+        """Test coadding SV1/SV3/DESI_TARGET with varying bits"""
+        nspec = 4
+        fm = Table()
+        fm['TARGETID'] = [111, 111, 222, 222]
+        fm['TILEID'] = 100 * np.ones(nspec, dtype=int)
+        fm['FIBERSTATUS'] = np.zeros(nspec, dtype=int)
+        fm['DESI_TARGET'] = 4 * np.ones(nspec, dtype=int)
+        fm['DESI_TARGET'][1] |= 8
+        fm['DESI_TARGET'][3] |= 16
+
+        fm['CMX_TARGET'] = fm['DESI_TARGET'].copy()
+        fm['SV1_DESI_TARGET'] = fm['DESI_TARGET'].copy()
+        fm['SV2_DESI_TARGET'] = fm['DESI_TARGET'].copy()
+        fm['SV3_DESI_TARGET'] = fm['DESI_TARGET'].copy()
+        fm['SV1_MWS_TARGET'] = fm['DESI_TARGET'].copy() + 32
+        fm['SV2_MWS_TARGET'] = fm['DESI_TARGET'].copy() + 32
+        fm['SV3_MWS_TARGET'] = fm['DESI_TARGET'].copy() + 32
+        fm['SV1_BGS_TARGET'] = fm['DESI_TARGET'].copy() + 64
+        fm['SV2_BGS_TARGET'] = fm['DESI_TARGET'].copy() + 64
+        fm['SV3_BGS_TARGET'] = fm['DESI_TARGET'].copy() + 64
+
+        cofm, expfm = coadd_fibermap(fm, onetile=True)
+        # first target has bitmasks 4+8=12
+        self.assertEqual(cofm['DESI_TARGET'][0], 12)
+        self.assertEqual(cofm['CMX_TARGET'][0], 12)
+        self.assertEqual(cofm['SV1_DESI_TARGET'][0], 12)
+        self.assertEqual(cofm['SV2_DESI_TARGET'][0], 12)
+        self.assertEqual(cofm['SV3_DESI_TARGET'][0], 12)
+        self.assertEqual(cofm['SV1_MWS_TARGET'][0], 12+32)
+        self.assertEqual(cofm['SV2_MWS_TARGET'][0], 12+32)
+        self.assertEqual(cofm['SV3_MWS_TARGET'][0], 12+32)
+        self.assertEqual(cofm['SV1_BGS_TARGET'][0], 12+64)
+        self.assertEqual(cofm['SV2_BGS_TARGET'][0], 12+64)
+        self.assertEqual(cofm['SV3_BGS_TARGET'][0], 12+64)
+
+        # second target has bitmasks 4+16=20
+        self.assertEqual(cofm['DESI_TARGET'][1], 20)
+        self.assertEqual(cofm['CMX_TARGET'][1], 20)
+        self.assertEqual(cofm['SV1_DESI_TARGET'][1], 20)
+        self.assertEqual(cofm['SV2_DESI_TARGET'][1], 20)
+        self.assertEqual(cofm['SV3_DESI_TARGET'][1], 20)
+        self.assertEqual(cofm['SV1_MWS_TARGET'][1], 20+32)
+        self.assertEqual(cofm['SV2_MWS_TARGET'][1], 20+32)
+        self.assertEqual(cofm['SV3_MWS_TARGET'][1], 20+32)
+        self.assertEqual(cofm['SV1_BGS_TARGET'][1], 20+64)
+        self.assertEqual(cofm['SV2_BGS_TARGET'][1], 20+64)
+        self.assertEqual(cofm['SV3_BGS_TARGET'][1], 20+64)
+
     def test_fiberstatus(self):
         """Test that FIBERSTATUS != 0 isn't included in coadd"""
         def _makespec(nspec, nwave):